31979489 has 16 divisors (see below), whose sum is σ = 35174400. Its totient is φ = 28957824.

The previous prime is 31979473. The next prime is 31979509. The reversal of 31979489 is 98497913.

31979489 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 31979489 - 2⁴ = 31979473 is a prime.

It is a super-2 number, since 2×31979489² = 2045375433402242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31979429) 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, 69749 + ... + 70205.

It is an arithmetic number, because the mean of its divisors is an integer number (2198400).

Almost surely, 2^31979489 is an apocalyptic number.

It is an amenable number.

31979489 is a deficient number, since it is larger than the sum of its proper divisors (3194911).

31979489 is a wasteful number, since it uses less digits than its factorization.

31979489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632.

The product of its digits is 489888, while the sum is 50.

The square root of 31979489 is about 5655.0410254922. The cubic root of 31979489 is about 317.4123642646.

The spelling of 31979489 in words is "thirty-one million, nine hundred seventy-nine thousand, four hundred eighty-nine".