251432081 has 2 divisors, whose sum is σ = 251432082. Its totient is φ = 251432080.

The previous prime is 251432029. The next prime is 251432123. The reversal of 251432081 is 180234152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 226231681 + 25200400 = 15041^2 + 5020^2 .

It is a cyclic number.

It is not a de Polignac number, because 251432081 - 2⁶ = 251432017 is a prime.

It is a super-2 number, since 2×251432081² = 126436182711981122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 251432081.

It is not a weakly prime, because it can be changed into another prime (251434081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125716040 + 125716041.

It is an arithmetic number, because the mean of its divisors is an integer number (125716041).

Almost surely, 2^251432081 is an apocalyptic number.

It is an amenable number.

251432081 is a deficient number, since it is larger than the sum of its proper divisors (1).

251432081 is an equidigital number, since it uses as much as digits as its factorization.

251432081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 251432081 is about 15856.6100097089. The cubic root of 251432081 is about 631.1611080789.

The spelling of 251432081 in words is "two hundred fifty-one million, four hundred thirty-two thousand, eighty-one".