31491432 has 48 divisors (see below), whose sum is σ = 97475040. Its totient is φ = 8997408.

The previous prime is 31491401. The next prime is 31491461. The reversal of 31491432 is 23419413.

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

It is a junction number, because it is equal to n+sod(n) for n = 31491396 and 31491405.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30738 + ... + 31745.

It is an arithmetic number, because the mean of its divisors is an integer number (2030730).

Almost surely, 2^31491432 is an apocalyptic number.

It is an amenable number.

31491432 is an abundant number, since it is smaller than the sum of its proper divisors (65983608).

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

31491432 is a wasteful number, since it uses less digits than its factorization.

31491432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62502 (or 62495 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 31491432 is about 5611.7227301427. The cubic root of 31491432 is about 315.7893431228.

The spelling of 31491432 in words is "thirty-one million, four hundred ninety-one thousand, four hundred thirty-two".