31292989 has 16 divisors (see below), whose sum is σ = 38660608. Its totient is φ = 24665472.

The previous prime is 31292969. The next prime is 31293007. The reversal of 31292989 is 98929213.

It is not a de Polignac number, because 31292989 - 2¹⁷ = 31161917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31292969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32929 + ... + 33865.

It is an arithmetic number, because the mean of its divisors is an integer number (2416288).

Almost surely, 2^31292989 is an apocalyptic number.

It is an amenable number.

31292989 is a deficient number, since it is larger than the sum of its proper divisors (7367619).

31292989 is a wasteful number, since it uses less digits than its factorization.

31292989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1324.

The product of its digits is 69984, while the sum is 43.

The square root of 31292989 is about 5594.0136753497. The cubic root of 31292989 is about 315.1246302835.

The spelling of 31292989 in words is "thirty-one million, two hundred ninety-two thousand, nine hundred eighty-nine".