251154961 has 2 divisors, whose sum is σ = 251154962. Its totient is φ = 251154960.

The previous prime is 251154949. The next prime is 251154989. The reversal of 251154961 is 169451152.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211527936 + 39627025 = 14544^2 + 6295^2 .

It is a cyclic number.

It is not a de Polignac number, because 251154961 - 2⁷ = 251154833 is a prime.

It is not a weakly prime, because it can be changed into another prime (251154361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125577480 + 125577481.

It is an arithmetic number, because the mean of its divisors is an integer number (125577481).

Almost surely, 2^251154961 is an apocalyptic number.

It is an amenable number.

251154961 is a deficient number, since it is larger than the sum of its proper divisors (1).

251154961 is an equidigital number, since it uses as much as digits as its factorization.

251154961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 34.

The square root of 251154961 is about 15847.8692889612. The cubic root of 251154961 is about 630.9291413069.

The spelling of 251154961 in words is "two hundred fifty-one million, one hundred fifty-four thousand, nine hundred sixty-one".