31431147 has 32 divisors (see below), whose sum is σ = 48833280. Its totient is φ = 17771520.

The previous prime is 31431139. The next prime is 31431161. The reversal of 31431147 is 74113413.

It is not a de Polignac number, because 31431147 - 2³ = 31431139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31431137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100263 + ... + 100575.

It is an arithmetic number, because the mean of its divisors is an integer number (1526040).

Almost surely, 2^31431147 is an apocalyptic number.

31431147 is a deficient number, since it is larger than the sum of its proper divisors (17402133).

31431147 is a wasteful number, since it uses less digits than its factorization.

31431147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its digits is 1008, while the sum is 24.

The square root of 31431147 is about 5606.3488118382. The cubic root of 31431147 is about 315.5877060402.

The spelling of 31431147 in words is "thirty-one million, four hundred thirty-one thousand, one hundred forty-seven".