1251038687879 has 4 divisors (see below), whose sum is σ = 1252351426176. Its totient is φ = 1249725949584.

The previous prime is 1251038687837. The next prime is 1251038687909. The reversal of 1251038687879 is 9787868301521.

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 1251038687879 - 2⁴⁰ = 151527060103 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 (1251038687809) 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, 656367719 + ... + 656369624.

It is an arithmetic number, because the mean of its divisors is an integer number (313087856544).

Almost surely, 2^{1251038687879} is an apocalyptic number.

1251038687879 is a deficient number, since it is larger than the sum of its proper divisors (1312738297).

1251038687879 is an equidigital number, since it uses as much as digits as its factorization.

1251038687879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312738296.

The product of its (nonzero) digits is 40642560, while the sum is 65.

The spelling of 1251038687879 in words is "one trillion, two hundred fifty-one billion, thirty-eight million, six hundred eighty-seven thousand, eight hundred seventy-nine".