31666939 has 6 divisors (see below), whose sum is σ = 33359460. Its totient is φ = 29977020.

The previous prime is 31666933. The next prime is 31666951. The reversal of 31666939 is 93966613.

It is not a de Polignac number, because 31666939 - 2¹¹ = 31664891 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31666895 and 31666904.

It is not an unprimeable number, because it can be changed into a prime (31666933) 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, 23884 + ... + 25174.

It is an arithmetic number, because the mean of its divisors is an integer number (5559910).

Almost surely, 2^31666939 is an apocalyptic number.

31666939 is a deficient number, since it is larger than the sum of its proper divisors (1692521).

31666939 is an frugal number, since it uses more digits than its factorization.

31666939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2601 (or 1310 counting only the distinct ones).

The product of its digits is 157464, while the sum is 43.

The square root of 31666939 is about 5627.3385361110. The cubic root of 31666939 is about 316.3749055372.

The spelling of 31666939 in words is "thirty-one million, six hundred sixty-six thousand, nine hundred thirty-nine".