31706013 has 4 divisors (see below), whose sum is σ = 42274688. Its totient is φ = 21137340.

The previous prime is 31706009. The next prime is 31706027. The reversal of 31706013 is 31060713.

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: 31060713 = 3 ⋅10353571.

It is not a de Polignac number, because 31706013 - 2² = 31706009 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31706033) 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, 5284333 + ... + 5284338.

It is an arithmetic number, because the mean of its divisors is an integer number (10568672).

Almost surely, 2^31706013 is an apocalyptic number.

It is an amenable number.

31706013 is a deficient number, since it is larger than the sum of its proper divisors (10568675).

31706013 is a wasteful number, since it uses less digits than its factorization.

31706013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10568674.

The product of its (nonzero) digits is 378, while the sum is 21.

The square root of 31706013 is about 5630.8092668816. The cubic root of 31706013 is about 316.5049775977.

Adding to 31706013 its reverse (31060713), we get a palindrome (62766726).

The spelling of 31706013 in words is "thirty-one million, seven hundred six thousand, thirteen".