31671973 has 4 divisors (see below), whose sum is σ = 32764140. Its totient is φ = 30579808.

The previous prime is 31671953. The next prime is 31671977. The reversal of 31671973 is 37917613.

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 6441444 + 25230529 = 2538^2 + 5023^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31671973 is a prime.

It is a super-2 number, since 2×31671973² = 2006227747425458, 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 (31671977) 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, 546040 + ... + 546097.

It is an arithmetic number, because the mean of its divisors is an integer number (8191035).

Almost surely, 2^31671973 is an apocalyptic number.

It is an amenable number.

31671973 is a deficient number, since it is larger than the sum of its proper divisors (1092167).

31671973 is a wasteful number, since it uses less digits than its factorization.

31671973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092166.

The product of its digits is 23814, while the sum is 37.

The square root of 31671973 is about 5627.7857990510. The cubic root of 31671973 is about 316.3916690445.

The spelling of 31671973 in words is "thirty-one million, six hundred seventy-one thousand, nine hundred seventy-three".