249157631 has 4 divisors (see below), whose sum is σ = 249373032. Its totient is φ = 248942232.

The previous prime is 249157619. The next prime is 249157663. The reversal of 249157631 is 136751942.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 249157631 - 2⁶ = 249157567 is a prime.

It is a super-2 number, since 2×249157631² = 124159050171064322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249157681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105956 + ... + 108281.

It is an arithmetic number, because the mean of its divisors is an integer number (62343258).

Almost surely, 2^249157631 is an apocalyptic number.

249157631 is a deficient number, since it is larger than the sum of its proper divisors (215401).

249157631 is a wasteful number, since it uses less digits than its factorization.

249157631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215400.

The product of its digits is 45360, while the sum is 38.

The square root of 249157631 is about 15784.7277771902. The cubic root of 249157631 is about 629.2521831472.

The spelling of 249157631 in words is "two hundred forty-nine million, one hundred fifty-seven thousand, six hundred thirty-one".