31591089 has 6 divisors (see below), whose sum is σ = 45631586. Its totient is φ = 21060720.

The previous prime is 31591067. The next prime is 31591093. The reversal of 31591089 is 98019513.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 29517489 + 2073600 = 5433^2 + 1440^2 .

It is not a de Polignac number, because 31591089 - 2⁸ = 31590833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31591009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1755052 + ... + 1755069.

Almost surely, 2^31591089 is an apocalyptic number.

It is an amenable number.

31591089 is a deficient number, since it is larger than the sum of its proper divisors (14040497).

31591089 is a wasteful number, since it uses less digits than its factorization.

31591089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510127 (or 3510124 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 31591089 is about 5620.5950752567. The cubic root of 31591089 is about 316.1221053776.

The spelling of 31591089 in words is "thirty-one million, five hundred ninety-one thousand, eighty-nine".