249972311 has 4 divisors (see below), whose sum is σ = 250512672. Its totient is φ = 249431952.

The previous prime is 249972299. The next prime is 249972319. The reversal of 249972311 is 113279942.

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 249972311 - 2²² = 245778007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249972319) 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, 269486 + ... + 270411.

It is an arithmetic number, because the mean of its divisors is an integer number (62628168).

Almost surely, 2^249972311 is an apocalyptic number.

249972311 is a deficient number, since it is larger than the sum of its proper divisors (540361).

249972311 is an equidigital number, since it uses as much as digits as its factorization.

249972311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540360.

The product of its digits is 27216, while the sum is 38.

The square root of 249972311 is about 15810.5126735347. The cubic root of 249972311 is about 629.9372667861.

The spelling of 249972311 in words is "two hundred forty-nine million, nine hundred seventy-two thousand, three hundred eleven".