251130881 has 2 divisors, whose sum is σ = 251130882. Its totient is φ = 251130880.

The previous prime is 251130871. The next prime is 251130949. The reversal of 251130881 is 188031152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 250937281 + 193600 = 15841^2 + 440^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251130881 is a prime.

It is a super-2 number, since 2×251130881² = 126133438783672322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (251130871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125565440 + 125565441.

It is an arithmetic number, because the mean of its divisors is an integer number (125565441).

Almost surely, 2^251130881 is an apocalyptic number.

It is an amenable number.

251130881 is a deficient number, since it is larger than the sum of its proper divisors (1).

251130881 is an equidigital number, since it uses as much as digits as its factorization.

251130881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 251130881 is about 15847.1095471698. The cubic root of 251130881 is about 630.9089767848.

The spelling of 251130881 in words is "two hundred fifty-one million, one hundred thirty thousand, eight hundred eighty-one".