251442313 has 2 divisors, whose sum is σ = 251442314. Its totient is φ = 251442312.

The previous prime is 251442293. The next prime is 251442337. The reversal of 251442313 is 313244152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136352329 + 115089984 = 11677^2 + 10728^2 .

It is a cyclic number.

It is not a de Polignac number, because 251442313 - 2¹³ = 251434121 is a prime.

It is not a weakly prime, because it can be changed into another prime (251442013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125721156 + 125721157.

It is an arithmetic number, because the mean of its divisors is an integer number (125721157).

Almost surely, 2^251442313 is an apocalyptic number.

It is an amenable number.

251442313 is a deficient number, since it is larger than the sum of its proper divisors (1).

251442313 is an equidigital number, since it uses as much as digits as its factorization.

251442313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 25.

The square root of 251442313 is about 15856.9326478988. The cubic root of 251442313 is about 631.1696696394.

Adding to 251442313 its reverse (313244152), we get a palindrome (564686465).

The spelling of 251442313 in words is "two hundred fifty-one million, four hundred forty-two thousand, three hundred thirteen".