31988923 has 2 divisors, whose sum is σ = 31988924. Its totient is φ = 31988922.

The previous prime is 31988921. The next prime is 31988941. The reversal of 31988923 is 32988913.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31988923 - 2¹ = 31988921 is a prime.

Together with 31988921, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 31988923.

It is not a weakly prime, because it can be changed into another prime (31988921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15994461 + 15994462.

It is an arithmetic number, because the mean of its divisors is an integer number (15994462).

Almost surely, 2^31988923 is an apocalyptic number.

31988923 is a deficient number, since it is larger than the sum of its proper divisors (1).

31988923 is an equidigital number, since it uses as much as digits as its factorization.

31988923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The square root of 31988923 is about 5655.8750870223. The cubic root of 31988923 is about 317.4435735796.

It can be divided in two parts, 3198 and 8923, that added together give a palindrome (12121).

The spelling of 31988923 in words is "thirty-one million, nine hundred eighty-eight thousand, nine hundred twenty-three".