31909629042 has 12 divisors (see below), whose sum is σ = 69137529630. Its totient is φ = 10636543008.

The previous prime is 31909629029. The next prime is 31909629043. The reversal of 31909629042 is 24092690913.

It is a happy number.

31909629042 is a `hidden beast` number, since 3 + 19 + 0 + 9 + 629 + 0 + 4 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 30178985841 + 1730643201 = 173721^2 + 41601^2 .

It is not an unprimeable number, because it can be changed into a prime (31909629043) 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, 886378567 + ... + 886378602.

Almost surely, 2^31909629042 is an apocalyptic number.

31909629042 is an abundant number, since it is smaller than the sum of its proper divisors (37227900588).

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

31909629042 is a wasteful number, since it uses less digits than its factorization.

31909629042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1772757177 (or 1772757174 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The spelling of 31909629042 in words is "thirty-one billion, nine hundred nine million, six hundred twenty-nine thousand, forty-two".