251240235031 has 2 divisors, whose sum is σ = 251240235032. Its totient is φ = 251240235030.

The previous prime is 251240235019. The next prime is 251240235047. The reversal of 251240235031 is 130532042152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251240235031 - 2¹⁵ = 251240202263 is a prime.

It is a super-2 number, since 2×251240235031² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251240035031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125620117515 + 125620117516.

It is an arithmetic number, because the mean of its divisors is an integer number (125620117516).

Almost surely, 2^251240235031 is an apocalyptic number.

251240235031 is a deficient number, since it is larger than the sum of its proper divisors (1).

251240235031 is an equidigital number, since it uses as much as digits as its factorization.

251240235031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 251240235031 its reverse (130532042152), we get a palindrome (381772277183).

The spelling of 251240235031 in words is "two hundred fifty-one billion, two hundred forty million, two hundred thirty-five thousand, thirty-one".