31161906 has 24 divisors (see below), whose sum is σ = 67623660. Its totient is φ = 10370976.

The previous prime is 31161869. The next prime is 31161917. The reversal of 31161906 is 60916113.

It can be written as a sum of positive squares in 2 ways, for example, as 22953681 + 8208225 = 4791^2 + 2865^2 .

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 31161906.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17380 + ... + 19088.

Almost surely, 2^31161906 is an apocalyptic number.

31161906 is an abundant number, since it is smaller than the sum of its proper divisors (36461754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31161906 is a wasteful number, since it uses less digits than its factorization.

31161906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730 (or 2727 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 31161906 is about 5582.2850160127. The cubic root of 31161906 is about 314.6840066233.

The spelling of 31161906 in words is "thirty-one million, one hundred sixty-one thousand, nine hundred six".