216941931 has 6 divisors (see below), whose sum is σ = 313360580. Its totient is φ = 144627948.

The previous prime is 216941903. The next prime is 216941951. The reversal of 216941931 is 139149612.

It is a happy number.

It is not a de Polignac number, because 216941931 - 2⁹ = 216941419 is a prime.

It is a super-2 number, since 2×216941931² = 94127602852017522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216941951) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12052321 + ... + 12052338.

Almost surely, 2^216941931 is an apocalyptic number.

216941931 is a deficient number, since it is larger than the sum of its proper divisors (96418649).

216941931 is a wasteful number, since it uses less digits than its factorization.

216941931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24104665 (or 24104662 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 216941931 is about 14728.9487404906. The cubic root of 216941931 is about 600.8708936289.

It can be divided in two parts, 2169 and 41931, that added together give a square (44100 = 210²).

The spelling of 216941931 in words is "two hundred sixteen million, nine hundred forty-one thousand, nine hundred thirty-one".