31973663 has 2 divisors, whose sum is σ = 31973664. Its totient is φ = 31973662.

The previous prime is 31973603. The next prime is 31973707. The reversal of 31973663 is 36637913.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31973663 - 2²² = 27779359 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31973603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15986831 + 15986832.

It is an arithmetic number, because the mean of its divisors is an integer number (15986832).

Almost surely, 2^31973663 is an apocalyptic number.

31973663 is a deficient number, since it is larger than the sum of its proper divisors (1).

31973663 is an equidigital number, since it uses as much as digits as its factorization.

31973663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 38.

The square root of 31973663 is about 5654.5258864029. The cubic root of 31973663 is about 317.3930877763.

The spelling of 31973663 in words is "thirty-one million, nine hundred seventy-three thousand, six hundred sixty-three".