251130949 has 2 divisors, whose sum is σ = 251130950. Its totient is φ = 251130948.

The previous prime is 251130881. The next prime is 251130973. The reversal of 251130949 is 949031152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206841924 + 44289025 = 14382^2 + 6655^2 .

It is a cyclic number.

It is not a de Polignac number, because 251130949 - 2⁹ = 251130437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251130149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125565474 + 125565475.

It is an arithmetic number, because the mean of its divisors is an integer number (125565475).

Almost surely, 2^251130949 is an apocalyptic number.

It is an amenable number.

251130949 is a deficient number, since it is larger than the sum of its proper divisors (1).

251130949 is an equidigital number, since it uses as much as digits as its factorization.

251130949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 251130949 is about 15847.1116926713. Note that the first 3 decimals coincide. The cubic root of 251130949 is about 630.9090337296.

The spelling of 251130949 in words is "two hundred fifty-one million, one hundred thirty thousand, nine hundred forty-nine".