31650138 has 24 divisors (see below), whose sum is σ = 73850868. Its totient is φ = 9738432.

The previous prime is 31650131. The next prime is 31650191. The reversal of 31650138 is 83105613.

31650138 is a `hidden beast` number, since 3 + 1 + 650 + 1 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31169889 + 480249 = 5583^2 + 693^2 .

It is not an unprimeable number, because it can be changed into a prime (31650131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67395 + ... + 67862.

Almost surely, 2^31650138 is an apocalyptic number.

31650138 is an abundant number, since it is smaller than the sum of its proper divisors (42200730).

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

31650138 is a wasteful number, since it uses less digits than its factorization.

31650138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135278 (or 135275 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 31650138 is about 5625.8455364505. The cubic root of 31650138 is about 316.3189443858.

The spelling of 31650138 in words is "thirty-one million, six hundred fifty thousand, one hundred thirty-eight".