31969697 has 4 divisors (see below), whose sum is σ = 32107140. Its totient is φ = 31832256.

The previous prime is 31969669. The next prime is 31969699. The reversal of 31969697 is 79696913.

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 10523536 + 21446161 = 3244^2 + 4631^2 .

It is a cyclic number.

It is not a de Polignac number, because 31969697 - 2¹² = 31965601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31969699) 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, 68372 + ... + 68837.

It is an arithmetic number, because the mean of its divisors is an integer number (8026785).

Almost surely, 2^31969697 is an apocalyptic number.

It is an amenable number.

31969697 is a deficient number, since it is larger than the sum of its proper divisors (137443).

31969697 is a wasteful number, since it uses less digits than its factorization.

31969697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137442.

The product of its digits is 551124, while the sum is 50.

The square root of 31969697 is about 5654.1751829953. The cubic root of 31969697 is about 317.3799641310.

The spelling of 31969697 in words is "thirty-one million, nine hundred sixty-nine thousand, six hundred ninety-seven".