31191696 has 80 divisors (see below), whose sum is σ = 90529920. Its totient is φ = 10281600.

The previous prime is 31191689. The next prime is 31191731. The reversal of 31191696 is 69619113.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 31191696.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44146 + ... + 44846.

It is an arithmetic number, because the mean of its divisors is an integer number (1131624).

Almost surely, 2^31191696 is an apocalyptic number.

31191696 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31191696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45264960).

31191696 is an abundant number, since it is smaller than the sum of its proper divisors (59338224).

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

31191696 is a wasteful number, since it uses less digits than its factorization.

31191696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821 (or 809 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 31191696 is about 5584.9526408019. The cubic root of 31191696 is about 314.7842513569.

The spelling of 31191696 in words is "thirty-one million, one hundred ninety-one thousand, six hundred ninety-six".