251660951 has 2 divisors, whose sum is σ = 251660952. Its totient is φ = 251660950.

The previous prime is 251660887. The next prime is 251660953. The reversal of 251660951 is 159066152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251660951 - 2⁶ = 251660887 is a prime.

Together with 251660953, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251660953) 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, 125830475 + 125830476.

It is an arithmetic number, because the mean of its divisors is an integer number (125830476).

Almost surely, 2^251660951 is an apocalyptic number.

251660951 is a deficient number, since it is larger than the sum of its proper divisors (1).

251660951 is an equidigital number, since it uses as much as digits as its factorization.

251660951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 251660951 is about 15863.8252322698. The cubic root of 251660951 is about 631.3525581038.

The spelling of 251660951 in words is "two hundred fifty-one million, six hundred sixty thousand, nine hundred fifty-one".