31133930 has 8 divisors (see below), whose sum is σ = 56041092. Its totient is φ = 12453568.

The previous prime is 31133917. The next prime is 31133933. The reversal of 31133930 is 3933113.

It can be written as a sum of positive squares in 2 ways, for example, as 30614089 + 519841 = 5533^2 + 721^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31133896 and 31133905.

It is not an unprimeable number, because it can be changed into a prime (31133933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1556687 + ... + 1556706.

Almost surely, 2^31133930 is an apocalyptic number.

31133930 is a deficient number, since it is larger than the sum of its proper divisors (24907162).

31133930 is a wasteful number, since it uses less digits than its factorization.

31133930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3113400.

The product of its (nonzero) digits is 729, while the sum is 23.

The square root of 31133930 is about 5579.7786694456. The cubic root of 31133930 is about 314.5898078966.

The spelling of 31133930 in words is "thirty-one million, one hundred thirty-three thousand, nine hundred thirty".