31696397 has 4 divisors (see below), whose sum is σ = 31713660. Its totient is φ = 31679136.

The previous prime is 31696363. The next prime is 31696439. The reversal of 31696397 is 79369613.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28665316 + 3031081 = 5354^2 + 1741^2 .

It is a cyclic number.

It is not a de Polignac number, because 31696397 - 2⁸ = 31696141 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 (31696307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5498 + ... + 9675.

It is an arithmetic number, because the mean of its divisors is an integer number (7928415).

Almost surely, 2^31696397 is an apocalyptic number.

It is an amenable number.

31696397 is a deficient number, since it is larger than the sum of its proper divisors (17263).

31696397 is a wasteful number, since it uses less digits than its factorization.

31696397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17262.

The product of its digits is 183708, while the sum is 44.

The square root of 31696397 is about 5629.9553284196. The cubic root of 31696397 is about 316.4729771524.

The spelling of 31696397 in words is "thirty-one million, six hundred ninety-six thousand, three hundred ninety-seven".