31491960 has 32 divisors (see below), whose sum is σ = 94476240. Its totient is φ = 8397824.

The previous prime is 31491959. The next prime is 31491983. The reversal of 31491960 is 6919413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131097 + ... + 131336.

Almost surely, 2^31491960 is an apocalyptic number.

31491960 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31491960 is an abundant number, since it is smaller than the sum of its proper divisors (62984280).

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

31491960 is a wasteful number, since it uses less digits than its factorization.

31491960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262447 (or 262443 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 31491960 is about 5611.7697743225. The cubic root of 31491960 is about 315.7911080032.

The spelling of 31491960 in words is "thirty-one million, four hundred ninety-one thousand, nine hundred sixty".