31431841 has 4 divisors (see below), whose sum is σ = 35922112. Its totient is φ = 26941572.

The previous prime is 31431821. The next prime is 31431857. The reversal of 31431841 is 14813413.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14813413 = 47 ⋅315179.

It is not a de Polignac number, because 31431841 - 2⁷ = 31431713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31431811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2245125 + ... + 2245138.

It is an arithmetic number, because the mean of its divisors is an integer number (8980528).

Almost surely, 2^31431841 is an apocalyptic number.

It is an amenable number.

31431841 is a deficient number, since it is larger than the sum of its proper divisors (4490271).

31431841 is an equidigital number, since it uses as much as digits as its factorization.

31431841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4490270.

The product of its digits is 1152, while the sum is 25.

The square root of 31431841 is about 5606.4107056119. The cubic root of 31431841 is about 315.5900287496.

The spelling of 31431841 in words is "thirty-one million, four hundred thirty-one thousand, eight hundred forty-one".