31818923 has 4 divisors (see below), whose sum is σ = 31936608. Its totient is φ = 31701240.

The previous prime is 31818893. The next prime is 31818931. The reversal of 31818923 is 32981813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32981813 = 281 ⋅117373.

It is a cyclic number.

It is not a de Polignac number, because 31818923 - 2¹⁰ = 31817899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31818023) 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, 58436 + ... + 58977.

It is an arithmetic number, because the mean of its divisors is an integer number (7984152).

Almost surely, 2^31818923 is an apocalyptic number.

31818923 is a deficient number, since it is larger than the sum of its proper divisors (117685).

31818923 is a wasteful number, since it uses less digits than its factorization.

31818923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117684.

The product of its digits is 10368, while the sum is 35.

The square root of 31818923 is about 5640.8264465413. The cubic root of 31818923 is about 316.8802401658.

The spelling of 31818923 in words is "thirty-one million, eight hundred eighteen thousand, nine hundred twenty-three".