251626121 has 2 divisors, whose sum is σ = 251626122. Its totient is φ = 251626120.

The previous prime is 251626087. The next prime is 251626169. The reversal of 251626121 is 121626152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249987721 + 1638400 = 15811^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 251626121 - 2¹⁴ = 251609737 is a prime.

It is not a weakly prime, because it can be changed into another prime (251626321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125813060 + 125813061.

It is an arithmetic number, because the mean of its divisors is an integer number (125813061).

Almost surely, 2^251626121 is an apocalyptic number.

It is an amenable number.

251626121 is a deficient number, since it is larger than the sum of its proper divisors (1).

251626121 is an equidigital number, since it uses as much as digits as its factorization.

251626121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 26.

The square root of 251626121 is about 15862.7274136575. The cubic root of 251626121 is about 631.3234302580.

The spelling of 251626121 in words is "two hundred fifty-one million, six hundred twenty-six thousand, one hundred twenty-one".