251295461 has 2 divisors, whose sum is σ = 251295462. Its totient is φ = 251295460.

The previous prime is 251295449. The next prime is 251295481. The reversal of 251295461 is 164592152.

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., 218862436 + 32433025 = 14794^2 + 5695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251295461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251295481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125647730 + 125647731.

It is an arithmetic number, because the mean of its divisors is an integer number (125647731).

Almost surely, 2^251295461 is an apocalyptic number.

It is an amenable number.

251295461 is a deficient number, since it is larger than the sum of its proper divisors (1).

251295461 is an equidigital number, since it uses as much as digits as its factorization.

251295461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 35.

The square root of 251295461 is about 15852.3014417466. The cubic root of 251295461 is about 631.0467699072.

The spelling of 251295461 in words is "two hundred fifty-one million, two hundred ninety-five thousand, four hundred sixty-one".