31491104 has 24 divisors (see below), whose sum is σ = 62352108. Its totient is φ = 15655680.

The previous prime is 31491101. The next prime is 31491143. The reversal of 31491104 is 40119413.

It can be written as a sum of positive squares in 2 ways, for example, as 28601104 + 2890000 = 5348^2 + 1700^2 .

It is a super-2 number, since 2×31491104² = 1983379262277632, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31491104.

It is not an unprimeable number, because it can be changed into a prime (31491101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3074 + ... + 8510.

Almost surely, 2^31491104 is an apocalyptic number.

It is an amenable number.

31491104 is a deficient number, since it is larger than the sum of its proper divisors (30861004).

31491104 is a wasteful number, since it uses less digits than its factorization.

31491104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5628 (or 5620 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 31491104 is about 5611.6935055293. The cubic root of 31491104 is about 315.7882467477.

The spelling of 31491104 in words is "thirty-one million, four hundred ninety-one thousand, one hundred four".