251204761 has 2 divisors, whose sum is σ = 251204762. Its totient is φ = 251204760.

The previous prime is 251204741. The next prime is 251204773. The reversal of 251204761 is 167402152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208629136 + 42575625 = 14444^2 + 6525^2 .

It is a cyclic number.

It is not a de Polignac number, because 251204761 - 2²³ = 242816153 is a prime.

It is not a weakly prime, because it can be changed into another prime (251204741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125602380 + 125602381.

It is an arithmetic number, because the mean of its divisors is an integer number (125602381).

Almost surely, 2^251204761 is an apocalyptic number.

It is an amenable number.

251204761 is a deficient number, since it is larger than the sum of its proper divisors (1).

251204761 is an equidigital number, since it uses as much as digits as its factorization.

251204761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 251204761 is about 15849.4404002160. The cubic root of 251204761 is about 630.9708395937.

The spelling of 251204761 in words is "two hundred fifty-one million, two hundred four thousand, seven hundred sixty-one".