249723431 has 4 divisors (see below), whose sum is σ = 249796272. Its totient is φ = 249650592.

The previous prime is 249723391. The next prime is 249723433. The reversal of 249723431 is 134327942.

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 249723431 - 2²² = 245529127 is a prime.

It is a super-2 number, since 2×249723431² = 124723583980823522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249723391 and 249723400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249723433) 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, 31010 + ... + 38223.

It is an arithmetic number, because the mean of its divisors is an integer number (62449068).

Almost surely, 2^249723431 is an apocalyptic number.

249723431 is a deficient number, since it is larger than the sum of its proper divisors (72841).

249723431 is an equidigital number, since it uses as much as digits as its factorization.

249723431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72840.

The product of its digits is 36288, while the sum is 35.

The square root of 249723431 is about 15802.6400009619. The cubic root of 249723431 is about 629.7281358276.

The spelling of 249723431 in words is "two hundred forty-nine million, seven hundred twenty-three thousand, four hundred thirty-one".