1361661351 has 4 divisors (see below), whose sum is σ = 1815548472. Its totient is φ = 907774232.

The previous prime is 1361661313. The next prime is 1361661401. The reversal of 1361661351 is 1531661631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1361661351 - 2¹⁷ = 1361530279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1361611351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226943556 + ... + 226943561.

It is an arithmetic number, because the mean of its divisors is an integer number (453887118).

Almost surely, 2^1361661351 is an apocalyptic number.

1361661351 is a deficient number, since it is larger than the sum of its proper divisors (453887121).

1361661351 is an equidigital number, since it uses as much as digits as its factorization.

1361661351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453887120.

The product of its digits is 9720, while the sum is 33.

The square root of 1361661351 is about 36900.6958064479. The cubic root of 1361661351 is about 1108.3826107524.

The spelling of 1361661351 in words is "one billion, three hundred sixty-one million, six hundred sixty-one thousand, three hundred fifty-one".