31491106 has 16 divisors (see below), whose sum is σ = 50164920. Its totient is φ = 14775040.

The previous prime is 31491101. The next prime is 31491143. The reversal of 31491106 is 60119413.

It can be written as a sum of positive squares in 4 ways, for example, as 16475481 + 15015625 = 4059^2 + 3875^2 .

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12036 + ... + 14416.

Almost surely, 2^31491106 is an apocalyptic number.

31491106 is a deficient number, since it is larger than the sum of its proper divisors (18673814).

31491106 is a wasteful number, since it uses less digits than its factorization.

31491106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2789.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 31491106 is about 5611.6936837286. The cubic root of 31491106 is about 315.7882534329.

The spelling of 31491106 in words is "thirty-one million, four hundred ninety-one thousand, one hundred six".