31133997 has 32 divisors (see below), whose sum is σ = 47520000. Its totient is φ = 20139840.

The previous prime is 31133981. The next prime is 31134001. The reversal of 31133997 is 79933113.

31133997 is a `hidden beast` number, since 311 + 339 + 9 + 7 = 666.

It is not a de Polignac number, because 31133997 - 2⁴ = 31133981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31133917) 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 31 ways as a sum of consecutive naturals, for example, 208879 + ... + 209027.

It is an arithmetic number, because the mean of its divisors is an integer number (1485000).

Almost surely, 2^31133997 is an apocalyptic number.

It is an amenable number.

31133997 is a deficient number, since it is larger than the sum of its proper divisors (16386003).

31133997 is a wasteful number, since it uses less digits than its factorization.

31133997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338 (or 332 counting only the distinct ones).

The product of its digits is 15309, while the sum is 36.

The square root of 31133997 is about 5579.7846732647. The cubic root of 31133997 is about 314.5900335615.

The spelling of 31133997 in words is "thirty-one million, one hundred thirty-three thousand, nine hundred ninety-seven".