31968813 has 8 divisors (see below), whose sum is σ = 42936768. Its totient is φ = 21156704.

The previous prime is 31968803. The next prime is 31968877. The reversal of 31968813 is 31886913.

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 31968813 - 2⁸ = 31968557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31968803) 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, 38481 + ... + 39302.

It is an arithmetic number, because the mean of its divisors is an integer number (5367096).

Almost surely, 2^31968813 is an apocalyptic number.

It is an amenable number.

31968813 is a deficient number, since it is larger than the sum of its proper divisors (10967955).

31968813 is a wasteful number, since it uses less digits than its factorization.

31968813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77923.

The product of its digits is 31104, while the sum is 39.

The square root of 31968813 is about 5654.0970101334. The cubic root of 31968813 is about 317.3770387933.

The spelling of 31968813 in words is "thirty-one million, nine hundred sixty-eight thousand, eight hundred thirteen".