31089312 has 48 divisors (see below), whose sum is σ = 90679680. Its totient is φ = 10362816.

The previous prime is 31089299. The next prime is 31089319. The reversal of 31089312 is 21398013.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31089319) 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 7 ways as a sum of consecutive naturals, for example, 17128 + ... + 18855.

It is an arithmetic number, because the mean of its divisors is an integer number (1889160).

Almost surely, 2^31089312 is an apocalyptic number.

31089312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31089312 is an abundant number, since it is smaller than the sum of its proper divisors (59590368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31089312 is a wasteful number, since it uses less digits than its factorization.

31089312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36002 (or 35988 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 31089312 is about 5575.7790487070. The cubic root of 31089312 is about 314.4394566179.

The spelling of 31089312 in words is "thirty-one million, eighty-nine thousand, three hundred twelve".