31113390 has 64 divisors (see below), whose sum is σ = 93104640. Its totient is φ = 6464640.

The previous prime is 31113371. The next prime is 31113391. The reversal of 31113390 is 9331113.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31113391) 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, 4425 + ... + 9044.

It is an arithmetic number, because the mean of its divisors is an integer number (1454760).

Almost surely, 2^31113390 is an apocalyptic number.

31113390 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

31113390 is an abundant number, since it is smaller than the sum of its proper divisors (61991250).

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

31113390 is a wasteful number, since it uses less digits than its factorization.

31113390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13497.

The product of its (nonzero) digits is 243, while the sum is 21.

The square root of 31113390 is about 5577.9377909762. The cubic root of 31113390 is about 314.5206111910.

The spelling of 31113390 in words is "thirty-one million, one hundred thirteen thousand, three hundred ninety".