251423213 has 2 divisors, whose sum is σ = 251423214. Its totient is φ = 251423212.

The previous prime is 251423171. The next prime is 251423233. The reversal of 251423213 is 312324152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 245768329 + 5654884 = 15677^2 + 2378^2 .

It is a cyclic number.

It is not a de Polignac number, because 251423213 - 2⁸ = 251422957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251423233) 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, 125711606 + 125711607.

It is an arithmetic number, because the mean of its divisors is an integer number (125711607).

Almost surely, 2^251423213 is an apocalyptic number.

It is an amenable number.

251423213 is a deficient number, since it is larger than the sum of its proper divisors (1).

251423213 is an equidigital number, since it uses as much as digits as its factorization.

251423213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 251423213 is about 15856.3303762251. The cubic root of 251423213 is about 631.1536876489.

Adding to 251423213 its reverse (312324152), we get a palindrome (563747365).

The spelling of 251423213 in words is "two hundred fifty-one million, four hundred twenty-three thousand, two hundred thirteen".