249885971 has 2 divisors, whose sum is σ = 249885972. Its totient is φ = 249885970.

The previous prime is 249885949. The next prime is 249885989. The reversal of 249885971 is 179588942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249885971 - 2²⁶ = 182777107 is a prime.

It is a super-2 number, since 2×249885971² = 124885997005225682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249885071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124942985 + 124942986.

It is an arithmetic number, because the mean of its divisors is an integer number (124942986).

Almost surely, 2^249885971 is an apocalyptic number.

249885971 is a deficient number, since it is larger than the sum of its proper divisors (1).

249885971 is an equidigital number, since it uses as much as digits as its factorization.

249885971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 53.

The square root of 249885971 is about 15807.7819759763. The cubic root of 249885971 is about 629.8647320235.

The spelling of 249885971 in words is "two hundred forty-nine million, eight hundred eighty-five thousand, nine hundred seventy-one".