213870731 has 8 divisors (see below), whose sum is σ = 216771984. Its totient is φ = 210988960.

The previous prime is 213870689. The next prime is 213870739. The reversal of 213870731 is 137078312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213870731 is a prime.

It is a super-2 number, since 2×213870731² = 91481379156948722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213870739) 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, 17945 + ... + 27381.

It is an arithmetic number, because the mean of its divisors is an integer number (27096498).

Almost surely, 2^213870731 is an apocalyptic number.

213870731 is a deficient number, since it is larger than the sum of its proper divisors (2901253).

213870731 is a wasteful number, since it uses less digits than its factorization.

213870731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9741.

The product of its (nonzero) digits is 7056, while the sum is 32.

The square root of 213870731 is about 14624.3198474322. The cubic root of 213870731 is about 598.0219405976.

The spelling of 213870731 in words is "two hundred thirteen million, eight hundred seventy thousand, seven hundred thirty-one".