31347139 has 8 divisors (see below), whose sum is σ = 31933440. Its totient is φ = 30765000.

The previous prime is 31347119. The next prime is 31347143. The reversal of 31347139 is 93174313.

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 31347139 - 2¹⁹ = 30822851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31347139.

It is not an unprimeable number, because it can be changed into a prime (31347109) 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, 16942 + ... + 18700.

It is an arithmetic number, because the mean of its divisors is an integer number (3991680).

Almost surely, 2^31347139 is an apocalyptic number.

31347139 is a deficient number, since it is larger than the sum of its proper divisors (586301).

31347139 is a wasteful number, since it uses less digits than its factorization.

31347139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2081.

The product of its digits is 6804, while the sum is 31.

The square root of 31347139 is about 5598.8515786722. The cubic root of 31347139 is about 315.3062914809.

The spelling of 31347139 in words is "thirty-one million, three hundred forty-seven thousand, one hundred thirty-nine".