249531213 has 4 divisors (see below), whose sum is σ = 332708288. Its totient is φ = 166354140.

The previous prime is 249531211. The next prime is 249531223. The reversal of 249531213 is 312135942.

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.

It is not a de Polignac number, because 249531213 - 2¹ = 249531211 is a prime.

It is a super-2 number, since 2×249531213² = 124531652522502738, 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 (249531211) 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, 41588533 + ... + 41588538.

It is an arithmetic number, because the mean of its divisors is an integer number (83177072).

Almost surely, 2^249531213 is an apocalyptic number.

It is an amenable number.

249531213 is a deficient number, since it is larger than the sum of its proper divisors (83177075).

249531213 is an equidigital number, since it uses as much as digits as its factorization.

249531213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83177074.

The product of its digits is 6480, while the sum is 30.

The square root of 249531213 is about 15796.5569982829. The cubic root of 249531213 is about 629.5665221674.

The spelling of 249531213 in words is "two hundred forty-nine million, five hundred thirty-one thousand, two hundred thirteen".