1251532215156 has 24 divisors (see below), whose sum is σ = 3092020767360. Its totient is φ = 392637557632.

The previous prime is 1251532215137. The next prime is 1251532215161. The reversal of 1251532215156 is 6515122351521.

It is a super-2 number, since 2×1251532215156² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3067480716 + ... + 3067481123.

It is an arithmetic number, because the mean of its divisors is an integer number (128834198640).

Almost surely, 2^{1251532215156} is an apocalyptic number.

It is an amenable number.

1251532215156 is an abundant number, since it is smaller than the sum of its proper divisors (1840488552204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251532215156 is a wasteful number, since it uses less digits than its factorization.

1251532215156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6134961863 (or 6134961861 counting only the distinct ones).

The product of its digits is 90000, while the sum is 39.

Adding to 1251532215156 its reverse (6515122351521), we get a palindrome (7766654566677).

The spelling of 1251532215156 in words is "one trillion, two hundred fifty-one billion, five hundred thirty-two million, two hundred fifteen thousand, one hundred fifty-six".