31491107 has 6 divisors (see below), whose sum is σ = 32366628. Its totient is φ = 30638664.

The previous prime is 31491101. The next prime is 31491143. The reversal of 31491107 is 70119413.

It is not a de Polignac number, because 31491107 - 2⁶ = 31491043 is a prime.

It is a super-4 number, since 4×31491107⁴ (a number of 31 digits) contains 4444 as substring.

It is a Duffinian number.

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 5 ways as a sum of consecutive naturals, for example, 10133 + ... + 12870.

It is an arithmetic number, because the mean of its divisors is an integer number (5394438).

Almost surely, 2^31491107 is an apocalyptic number.

31491107 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

31491107 is a deficient number, since it is larger than the sum of its proper divisors (875521).

31491107 is an equidigital number, since it uses as much as digits as its factorization.

31491107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23077 (or 23040 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 31491107 is about 5611.6937728283. The cubic root of 31491107 is about 315.7882567755.

The spelling of 31491107 in words is "thirty-one million, four hundred ninety-one thousand, one hundred seven".