251041997 has 4 divisors (see below), whose sum is σ = 251086080. Its totient is φ = 250997916.

The previous prime is 251041979. The next prime is 251042017. The reversal of 251041997 is 799140152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 251041997 - 2¹⁴ = 251025613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 251041997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251041957) 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 in 3 ways as a sum of consecutive naturals, for example, 11963 + ... + 25400.

It is an arithmetic number, because the mean of its divisors is an integer number (62771520).

Almost surely, 2^251041997 is an apocalyptic number.

It is an amenable number.

251041997 is a deficient number, since it is larger than the sum of its proper divisors (44083).

251041997 is an equidigital number, since it uses as much as digits as its factorization.

251041997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44082.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 251041997 is about 15844.3048758852. The cubic root of 251041997 is about 630.8345344190.

The spelling of 251041997 in words is "two hundred fifty-one million, forty-one thousand, nine hundred ninety-seven".