1219348186081 has 3 divisors (see below), whose sum is σ = 1219349290323. Its totient is φ = 1219347081840.

The previous prime is 1219348186003. The next prime is 1219348186109. The reversal of 1219348186081 is 1806818439121.

The square root of 1219348186081 is 1104241.

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., 774032203681 + 445315982400 = 879791^2 + 667320^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1219348186081 is a prime.

It is a super-2 number, since 2×1219348186081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1219348186781) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 552121 + ... + 1656361.

It is an arithmetic number, because the mean of its divisors is an integer number (406449763441).

Almost surely, 2^{1219348186081} is an apocalyptic number.

1219348186081 is the 1104241-st square number.

1219348186081 is the 552121-st centered octagonal number.

It is an amenable number.

1219348186081 is a deficient number, since it is larger than the sum of its proper divisors (1104242).

1219348186081 is an frugal number, since it uses more digits than its factorization.

1219348186081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208482 (or 1104241 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 52.

The spelling of 1219348186081 in words is "one trillion, two hundred nineteen billion, three hundred forty-eight million, one hundred eighty-six thousand, eighty-one".