31791492 has 72 divisors (see below), whose sum is σ = 84494592. Its totient is φ = 10065600.

The previous prime is 31791481. The next prime is 31791499. The reversal of 31791492 is 29419713.

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

It is not an unprimeable number, because it can be changed into a prime (31791499) 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 23 ways as a sum of consecutive naturals, for example, 67843 + ... + 68309.

It is an arithmetic number, because the mean of its divisors is an integer number (1173536).

Almost surely, 2^31791492 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31791492, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42247296).

31791492 is an abundant number, since it is smaller than the sum of its proper divisors (52703100).

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

31791492 is a wasteful number, since it uses less digits than its factorization.

31791492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569 (or 564 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 31791492 is about 5638.3944523242. The cubic root of 31791492 is about 316.7891534777.

It can be divided in two parts, 317 and 91492, that added together give a square (91809 = 303²).

The spelling of 31791492 in words is "thirty-one million, seven hundred ninety-one thousand, four hundred ninety-two".