249263257 has 4 divisors (see below), whose sum is σ = 249515776. Its totient is φ = 249010740.

The previous prime is 249263243. The next prime is 249263291. The reversal of 249263257 is 752362942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 752362942 = 2 ⋅376181471.

It is a cyclic number.

It is not a de Polignac number, because 249263257 - 2²⁷ = 115045529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249263227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124773 + ... + 126754.

It is an arithmetic number, because the mean of its divisors is an integer number (62378944).

Almost surely, 2^249263257 is an apocalyptic number.

It is an amenable number.

249263257 is a deficient number, since it is larger than the sum of its proper divisors (252519).

249263257 is an equidigital number, since it uses as much as digits as its factorization.

249263257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252518.

The product of its digits is 181440, while the sum is 40.

The square root of 249263257 is about 15788.0732516669. The cubic root of 249263257 is about 629.3410907205.

The spelling of 249263257 in words is "two hundred forty-nine million, two hundred sixty-three thousand, two hundred fifty-seven".