249664213 has 4 divisors (see below), whose sum is σ = 249695968. Its totient is φ = 249632460.

The previous prime is 249664201. The next prime is 249664229. The reversal of 249664213 is 312466942.

It is a happy number.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249664213 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 (249664243) 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, 5608 + ... + 23038.

It is an arithmetic number, because the mean of its divisors is an integer number (62423992).

Almost surely, 2^249664213 is an apocalyptic number.

It is an amenable number.

249664213 is a deficient number, since it is larger than the sum of its proper divisors (31755).

249664213 is a wasteful number, since it uses less digits than its factorization.

249664213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31754.

The product of its digits is 62208, while the sum is 37.

The square root of 249664213 is about 15800.7662155985. The cubic root of 249664213 is about 629.6783551714.

The spelling of 249664213 in words is "two hundred forty-nine million, six hundred sixty-four thousand, two hundred thirteen".