31139841 has 16 divisors (see below), whose sum is σ = 45117440. Its totient is φ = 19031760.

The previous prime is 31139821. The next prime is 31139863. The reversal of 31139841 is 14893113.

It is not a de Polignac number, because 31139841 - 2⁵ = 31139809 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31139799 and 31139808.

It is not an unprimeable number, because it can be changed into a prime (31139821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7045 + ... + 10578.

It is an arithmetic number, because the mean of its divisors is an integer number (2819840).

Almost surely, 2^31139841 is an apocalyptic number.

31139841 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31139841 is a deficient number, since it is larger than the sum of its proper divisors (13977599).

31139841 is a wasteful number, since it uses less digits than its factorization.

31139841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17676.

The product of its digits is 2592, while the sum is 30.

The square root of 31139841 is about 5580.3083248150. The cubic root of 31139841 is about 314.6097156809.

The spelling of 31139841 in words is "thirty-one million, one hundred thirty-nine thousand, eight hundred forty-one".