31663973 has 4 divisors (see below), whose sum is σ = 34542528. Its totient is φ = 28785420.

The previous prime is 31663963. The next prime is 31663997. The reversal of 31663973 is 37936613.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31663973 - 2⁶ = 31663909 is a prime.

It is a super-2 number, since 2×31663973² = 2005214372289458, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31663913) 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, 1439261 + ... + 1439282.

It is an arithmetic number, because the mean of its divisors is an integer number (8635632).

Almost surely, 2^31663973 is an apocalyptic number.

It is an amenable number.

31663973 is a deficient number, since it is larger than the sum of its proper divisors (2878555).

31663973 is a wasteful number, since it uses less digits than its factorization.

31663973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2878554.

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

The square root of 31663973 is about 5627.0749950574. The cubic root of 31663973 is about 316.3650277561.

The spelling of 31663973 in words is "thirty-one million, six hundred sixty-three thousand, nine hundred seventy-three".