213715731 has 8 divisors (see below), whose sum is σ = 285762960. Its totient is φ = 142072832.

The previous prime is 213715717. The next prime is 213715771. The reversal of 213715731 is 137517312.

213715731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213715731 - 2⁵ = 213715699 is a prime.

It is a super-2 number, since 2×213715731² = 91348827353728722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (213715771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99846 + ... + 101963.

It is an arithmetic number, because the mean of its divisors is an integer number (35720370).

Almost surely, 2^213715731 is an apocalyptic number.

213715731 is a deficient number, since it is larger than the sum of its proper divisors (72047229).

213715731 is a wasteful number, since it uses less digits than its factorization.

213715731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202165.

The product of its digits is 4410, while the sum is 30.

The square root of 213715731 is about 14619.0194951645. The cubic root of 213715731 is about 597.8774361701.

The spelling of 213715731 in words is "two hundred thirteen million, seven hundred fifteen thousand, seven hundred thirty-one".