7997251 has 2 divisors, whose sum is σ = 7997252. Its totient is φ = 7997250.

The previous prime is 7997239. The next prime is 7997257. The reversal of 7997251 is 1527997.

It is a strong prime.

It is an emirp because it is prime and its reverse (1527997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7997251 - 2⁵ = 7997219 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (7997257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3998625 + 3998626.

It is an arithmetic number, because the mean of its divisors is an integer number (3998626).

Almost surely, 2^7997251 is an apocalyptic number.

7997251 is a deficient number, since it is larger than the sum of its proper divisors (1).

7997251 is an equidigital number, since it uses as much as digits as its factorization.

7997251 is an odious number, because the sum of its binary digits is odd.

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

The square root of 7997251 is about 2827.9411238567. The cubic root of 7997251 is about 199.9770890422.

The spelling of 7997251 in words is "seven million, nine hundred ninety-seven thousand, two hundred fifty-one".