31684493 has 4 divisors (see below), whose sum is σ = 31695840. Its totient is φ = 31673148.

The previous prime is 31684463. The next prime is 31684529. The reversal of 31684493 is 39448613.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31684493 - 2²² = 27490189 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 (31684463) 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, 1778 + ... + 8156.

It is an arithmetic number, because the mean of its divisors is an integer number (7923960).

Almost surely, 2^31684493 is an apocalyptic number.

It is an amenable number.

31684493 is a deficient number, since it is larger than the sum of its proper divisors (11347).

31684493 is an equidigital number, since it uses as much as digits as its factorization.

31684493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11346.

The product of its digits is 62208, while the sum is 38.

The square root of 31684493 is about 5628.8980271453. The cubic root of 31684493 is about 316.4333536579.

It can be divided in two parts, 316844 and 93, that multiplied together give a palindrome (29466492).

The spelling of 31684493 in words is "thirty-one million, six hundred eighty-four thousand, four hundred ninety-three".