251420231 has 2 divisors, whose sum is σ = 251420232. Its totient is φ = 251420230.

The previous prime is 251420207. The next prime is 251420243. The reversal of 251420231 is 132024152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251420231 - 2⁶ = 251420167 is a prime.

It is a super-2 number, since 2×251420231² = 126424265112186722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251420201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125710115 + 125710116.

It is an arithmetic number, because the mean of its divisors is an integer number (125710116).

Almost surely, 2^251420231 is an apocalyptic number.

251420231 is a deficient number, since it is larger than the sum of its proper divisors (1).

251420231 is an equidigital number, since it uses as much as digits as its factorization.

251420231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 251420231 is about 15856.2363441013. The cubic root of 251420231 is about 631.1511923771.

Adding to 251420231 its reverse (132024152), we get a palindrome (383444383).

The spelling of 251420231 in words is "two hundred fifty-one million, four hundred twenty thousand, two hundred thirty-one".