31713813 has 12 divisors (see below), whose sum is σ = 45858540. Its totient is φ = 21119616.

The previous prime is 31713811. The next prime is 31713817. The reversal of 31713813 is 31831713.

It can be written as a sum of positive squares in 2 ways, for example, as 2196324 + 29517489 = 1482^2 + 5433^2 .

It is not a de Polignac number, because 31713813 - 2¹ = 31713811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31713811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12843 + ... + 15111.

It is an arithmetic number, because the mean of its divisors is an integer number (3821545).

Almost surely, 2^31713813 is an apocalyptic number.

It is an amenable number.

31713813 is a deficient number, since it is larger than the sum of its proper divisors (14144727).

31713813 is a wasteful number, since it uses less digits than its factorization.

31713813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3828 (or 3825 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 31713813 is about 5631.5018423152. The cubic root of 31713813 is about 316.5309299452.

The spelling of 31713813 in words is "thirty-one million, seven hundred thirteen thousand, eight hundred thirteen".