251163091 has 2 divisors, whose sum is σ = 251163092. Its totient is φ = 251163090.

The previous prime is 251163079. The next prime is 251163149. The reversal of 251163091 is 190361152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251163091 - 2⁷ = 251162963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (251163001) 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, 125581545 + 125581546.

It is an arithmetic number, because the mean of its divisors is an integer number (125581546).

Almost surely, 2^251163091 is an apocalyptic number.

251163091 is a deficient number, since it is larger than the sum of its proper divisors (1).

251163091 is an equidigital number, since it uses as much as digits as its factorization.

251163091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 251163091 is about 15848.1257882439. The cubic root of 251163091 is about 630.9359490543.

The spelling of 251163091 in words is "two hundred fifty-one million, one hundred sixty-three thousand, ninety-one".