31133990 has 8 divisors (see below), whose sum is σ = 56041200. Its totient is φ = 12453592.

The previous prime is 31133981. The next prime is 31134001. The reversal of 31133990 is 9933113.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1556690 + ... + 1556709.

It is an arithmetic number, because the mean of its divisors is an integer number (7005150).

Almost surely, 2^31133990 is an apocalyptic number.

31133990 is a deficient number, since it is larger than the sum of its proper divisors (24907210).

31133990 is a wasteful number, since it uses less digits than its factorization.

31133990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113406.

The product of its (nonzero) digits is 2187, while the sum is 29.

The square root of 31133990 is about 5579.7840460003. The cubic root of 31133990 is about 314.5900099846.

It can be divided in two parts, 31133 and 990, that added together give a palindrome (32123).

The spelling of 31133990 in words is "thirty-one million, one hundred thirty-three thousand, nine hundred ninety".