31491144 has 48 divisors (see below), whose sum is σ = 87601020. Its totient is φ = 10212480.

The previous prime is 31491143. The next prime is 31491149. The reversal of 31491144 is 44119413.

31491144 is a `hidden beast` number, since 31 + 491 + 144 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31472100 + 19044 = 5610^2 + 138^2 .

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

It is not an unprimeable number, because it can be changed into a prime (31491143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3247 + ... + 8574.

Almost surely, 2^31491144 is an apocalyptic number.

It is an amenable number.

31491144 is an abundant number, since it is smaller than the sum of its proper divisors (56109876).

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

31491144 is a wasteful number, since it uses less digits than its factorization.

31491144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11870 (or 11863 counting only the distinct ones).

The product of its digits is 1728, while the sum is 27.

The square root of 31491144 is about 5611.6970695147. The cubic root of 31491144 is about 315.7883804524.

The spelling of 31491144 in words is "thirty-one million, four hundred ninety-one thousand, one hundred forty-four".