1251532215157 has 4 divisors (see below), whose sum is σ = 1430322531616. Its totient is φ = 1072741898700.

The previous prime is 1251532215137. The next prime is 1251532215161. The reversal of 1251532215157 is 7515122351521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1251532215157 - 2⁷ = 1251532215029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251532215137) 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, 89395158219 + ... + 89395158232.

It is an arithmetic number, because the mean of its divisors is an integer number (357580632904).

Almost surely, 2^{1251532215157} is an apocalyptic number.

It is an amenable number.

1251532215157 is a deficient number, since it is larger than the sum of its proper divisors (178790316459).

1251532215157 is an equidigital number, since it uses as much as digits as its factorization.

1251532215157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178790316458.

The product of its digits is 105000, while the sum is 40.

Adding to 1251532215157 its reverse (7515122351521), we get a palindrome (8766654566678).

The spelling of 1251532215157 in words is "one trillion, two hundred fifty-one billion, five hundred thirty-two million, two hundred fifteen thousand, one hundred fifty-seven".