7997000251 has 2 divisors, whose sum is σ = 7997000252. Its totient is φ = 7997000250.

The previous prime is 7997000239. The next prime is 7997000257. The reversal of 7997000251 is 1520007997.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7997000251 is a prime.

It is not a weakly prime, because it can be changed into another prime (7997000257) by changing a digit.

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 as a sum of consecutive naturals, namely, 3998500125 + 3998500126.

It is an arithmetic number, because the mean of its divisors is an integer number (3998500126).

Almost surely, 2^7997000251 is an apocalyptic number.

7997000251 is a deficient number, since it is larger than the sum of its proper divisors (1).

7997000251 is an equidigital number, since it uses as much as digits as its factorization.

7997000251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 7997000251 is about 89425.9484210260. The cubic root of 7997000251 is about 1999.7499896654.

The spelling of 7997000251 in words is "seven billion, nine hundred ninety-seven million, two hundred fifty-one", and thus it is an aban number.