31791923 has 4 divisors (see below), whose sum is σ = 31805400. Its totient is φ = 31778448.

The previous prime is 31791913. The next prime is 31791953. The reversal of 31791923 is 32919713.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32919713 = 67 ⋅491339.

It is a cyclic number.

It is not a de Polignac number, because 31791923 - 2¹² = 31787827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31791913) 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, 2165 + ... + 8262.

It is an arithmetic number, because the mean of its divisors is an integer number (7951350).

Almost surely, 2^31791923 is an apocalyptic number.

31791923 is a deficient number, since it is larger than the sum of its proper divisors (13477).

31791923 is a wasteful number, since it uses less digits than its factorization.

31791923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13476.

The product of its digits is 10206, while the sum is 35.

The square root of 31791923 is about 5638.4326722947. The cubic root of 31791923 is about 316.7905850506.

It can be divided in two parts, 317919 and 23, that multiplied together give a palindrome (7312137).

The spelling of 31791923 in words is "thirty-one million, seven hundred ninety-one thousand, nine hundred twenty-three".