251320051 has 2 divisors, whose sum is σ = 251320052. Its totient is φ = 251320050.

The previous prime is 251320031. The next prime is 251320067. The reversal of 251320051 is 150023152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251320051 - 2⁵ = 251320019 is a prime.

It is not a weakly prime, because it can be changed into another prime (251320001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125660025 + 125660026.

It is an arithmetic number, because the mean of its divisors is an integer number (125660026).

Almost surely, 2^251320051 is an apocalyptic number.

251320051 is a deficient number, since it is larger than the sum of its proper divisors (1).

251320051 is an equidigital number, since it uses as much as digits as its factorization.

251320051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 251320051 is about 15853.0770199353. The cubic root of 251320051 is about 631.0673524967.

The spelling of 251320051 in words is "two hundred fifty-one million, three hundred twenty thousand, fifty-one".