7897191251 has 2 divisors, whose sum is σ = 7897191252. Its totient is φ = 7897191250.

The previous prime is 7897191229. The next prime is 7897191257. The reversal of 7897191251 is 1521917987.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7897191251 - 2²⁶ = 7830082387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7897191251.

It is not a weakly prime, because it can be changed into another prime (7897191257) 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 as a sum of consecutive naturals, namely, 3948595625 + 3948595626.

It is an arithmetic number, because the mean of its divisors is an integer number (3948595626).

Almost surely, 2^7897191251 is an apocalyptic number.

7897191251 is a deficient number, since it is larger than the sum of its proper divisors (1).

7897191251 is an equidigital number, since it uses as much as digits as its factorization.

7897191251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 50.

The square root of 7897191251 is about 88866.1423209087. The cubic root of 7897191251 is about 1991.3956398283.

The spelling of 7897191251 in words is "seven billion, eight hundred ninety-seven million, one hundred ninety-one thousand, two hundred fifty-one".