206987931 has 24 divisors (see below), whose sum is σ = 302754816. Its totient is φ = 136263600.

The previous prime is 206987927. The next prime is 206987941. The reversal of 206987931 is 139789602.

206987931 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206987931 - 2² = 206987927 is a prime.

It is a super-2 number, since 2×206987931² = 85688007159321522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (206987941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 302716 + ... + 303398.

It is an arithmetic number, because the mean of its divisors is an integer number (12614784).

Almost surely, 2^206987931 is an apocalyptic number.

206987931 is a deficient number, since it is larger than the sum of its proper divisors (95766885).

206987931 is a wasteful number, since it uses less digits than its factorization.

206987931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1063 (or 1060 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 206987931 is about 14387.0751370805. The cubic root of 206987931 is about 591.5366731365.

It can be divided in two parts, 2069 and 87931, that added together give a square (90000 = 300²).

The spelling of 206987931 in words is "two hundred six million, nine hundred eighty-seven thousand, nine hundred thirty-one".