251320461 has 12 divisors (see below), whose sum is σ = 389803392. Its totient is φ = 143611608.

The previous prime is 251320451. The next prime is 251320477. The reversal of 251320461 is 164023152.

It is not a de Polignac number, because 251320461 - 2⁶ = 251320397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251320451) 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 in 11 ways as a sum of consecutive naturals, for example, 854685 + ... + 854978.

It is an arithmetic number, because the mean of its divisors is an integer number (32483616).

Almost surely, 2^251320461 is an apocalyptic number.

251320461 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

251320461 is a deficient number, since it is larger than the sum of its proper divisors (138482931).

251320461 is a wasteful number, since it uses less digits than its factorization.

251320461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709680 (or 1709673 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 251320461 is about 15853.0899511736. The cubic root of 251320461 is about 631.0676956680.

The spelling of 251320461 in words is "two hundred fifty-one million, three hundred twenty thousand, four hundred sixty-one".