1351799203561 has 3 divisors (see below), whose sum is σ = 1351800366231. Its totient is φ = 1351798040892.

The previous prime is 1351799203529. The next prime is 1351799203679. The reversal of 1351799203561 is 1653029971531.

The square root of 1351799203561 is 1162669.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 123292979161 + 1228506224400 = 351131^2 + 1108380^2 .

It is not a de Polignac number, because 1351799203561 - 2⁵ = 1351799203529 is a prime.

It is a super-2 number, since 2×1351799203561² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1351799203499 and 1351799203508.

It is not an unprimeable number, because it can be changed into a prime (1351799293561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 581335 + ... + 1744003.

It is an arithmetic number, because the mean of its divisors is an integer number (450600122077).

Almost surely, 2^{1351799203561} is an apocalyptic number.

1351799203561 is the 1162669-th square number.

1351799203561 is the 581335-th centered octagonal number.

It is an amenable number.

1351799203561 is a deficient number, since it is larger than the sum of its proper divisors (1162670).

1351799203561 is an frugal number, since it uses more digits than its factorization.

1351799203561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2325338 (or 1162669 counting only the distinct ones).

The product of its (nonzero) digits is 1530900, while the sum is 52.

The spelling of 1351799203561 in words is "one trillion, three hundred fifty-one billion, seven hundred ninety-nine million, two hundred three thousand, five hundred sixty-one".