31671493 has 24 divisors (see below), whose sum is σ = 39410712. Its totient is φ = 25288704.

The previous prime is 31671481. The next prime is 31671511. The reversal of 31671493 is 39417613.

It can be written as a sum of positive squares in 4 ways, for example, as 13972644 + 17698849 = 3738^2 + 4207^2 .

It is a de Polignac number, because none of the positive numbers 2^k-31671493 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 (31671403) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160671 + ... + 160867.

It is an arithmetic number, because the mean of its divisors is an integer number (1642113).

Almost surely, 2^31671493 is an apocalyptic number.

It is an amenable number.

31671493 is a deficient number, since it is larger than the sum of its proper divisors (7739219).

31671493 is a wasteful number, since it uses less digits than its factorization.

31671493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421 (or 414 counting only the distinct ones).

The product of its digits is 13608, while the sum is 34.

The square root of 31671493 is about 5627.7431533431. The cubic root of 31671493 is about 316.3900706937.

The spelling of 31671493 in words is "thirty-one million, six hundred seventy-one thousand, four hundred ninety-three".