251252287899881 has 2 divisors, whose sum is σ = 251252287899882. Its totient is φ = 251252287899880.

The previous prime is 251252287899787. The next prime is 251252287899887. The reversal of 251252287899881 is 188998782252152.

251252287899881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189017402689600 + 62234885210281 = 13748360^2 + 7888909^2 .

It is a cyclic number.

It is not a de Polignac number, because 251252287899881 - 2²⁶ = 251252220791017 is a prime.

It is a super-2 number, since 2×251252287899881² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (251252287899887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125626143949940 + 125626143949941.

It is an arithmetic number, because the mean of its divisors is an integer number (125626143949941).

Almost surely, 2^{251252287899881} is an apocalyptic number.

It is an amenable number.

251252287899881 is a deficient number, since it is larger than the sum of its proper divisors (1).

251252287899881 is an equidigital number, since it uses as much as digits as its factorization.

251252287899881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 928972800, while the sum is 77.

The spelling of 251252287899881 in words is "two hundred fifty-one trillion, two hundred fifty-two billion, two hundred eighty-seven million, eight hundred ninety-nine thousand, eight hundred eighty-one".