31326139 has 8 divisors (see below), whose sum is σ = 33799472. Its totient is φ = 28861920.

The previous prime is 31326133. The next prime is 31326149. The reversal of 31326139 is 93162313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31326139 - 2⁷ = 31326011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31326133) 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, 6004 + ... + 9934.

It is an arithmetic number, because the mean of its divisors is an integer number (4224934).

Almost surely, 2^31326139 is an apocalyptic number.

31326139 is a deficient number, since it is larger than the sum of its proper divisors (2473333).

31326139 is a wasteful number, since it uses less digits than its factorization.

31326139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4557.

The product of its digits is 2916, while the sum is 28.

The square root of 31326139 is about 5596.9758798837. The cubic root of 31326139 is about 315.2358660079.

The spelling of 31326139 in words is "thirty-one million, three hundred twenty-six thousand, one hundred thirty-nine".