1252617965891 has 4 divisors (see below), whose sum is σ = 1255335141984. Its totient is φ = 1249900789800.

The previous prime is 1252617965839. The next prime is 1252617965941. The reversal of 1252617965891 is 1985697162521.

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 1252617965891 - 2²² = 1252613771587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1252617965191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1358587355 + ... + 1358588276.

It is an arithmetic number, because the mean of its divisors is an integer number (313833785496).

Almost surely, 2^{1252617965891} is an apocalyptic number.

1252617965891 is a deficient number, since it is larger than the sum of its proper divisors (2717176093).

1252617965891 is an equidigital number, since it uses as much as digits as its factorization.

1252617965891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717176092.

The product of its digits is 16329600, while the sum is 62.

The spelling of 1252617965891 in words is "one trillion, two hundred fifty-two billion, six hundred seventeen million, nine hundred sixty-five thousand, eight hundred ninety-one".