215140731 has 16 divisors (see below), whose sum is σ = 312646656. Its totient is φ = 130797216.

The previous prime is 215140699. The next prime is 215140733. The reversal of 215140731 is 137041512.

It is not a de Polignac number, because 215140731 - 2⁵ = 215140699 is a prime.

It is a super-2 number, since 2×215140731² = 92571068270428722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (215140733) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29995 + ... + 36468.

It is an arithmetic number, because the mean of its divisors is an integer number (19540416).

Almost surely, 2^215140731 is an apocalyptic number.

215140731 is a deficient number, since it is larger than the sum of its proper divisors (97505925).

215140731 is a wasteful number, since it uses less digits than its factorization.

215140731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66562.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 215140731 is about 14667.6764008482. The cubic root of 215140731 is about 599.2033232005.

The spelling of 215140731 in words is "two hundred fifteen million, one hundred forty thousand, seven hundred thirty-one".