251457139 has 2 divisors, whose sum is σ = 251457140. Its totient is φ = 251457138.

The previous prime is 251457127. The next prime is 251457161. The reversal of 251457139 is 931754152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251457139 - 2¹³ = 251448947 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251457098 and 251457107.

It is not a weakly prime, because it can be changed into another prime (251457109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125728569 + 125728570.

It is an arithmetic number, because the mean of its divisors is an integer number (125728570).

Almost surely, 2^251457139 is an apocalyptic number.

251457139 is a deficient number, since it is larger than the sum of its proper divisors (1).

251457139 is an equidigital number, since it uses as much as digits as its factorization.

251457139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 37.

The square root of 251457139 is about 15857.4001336915. The cubic root of 251457139 is about 631.1820747877.

The spelling of 251457139 in words is "two hundred fifty-one million, four hundred fifty-seven thousand, one hundred thirty-nine".