31666423 has 8 divisors (see below), whose sum is σ = 33366528. Its totient is φ = 29993304.

The previous prime is 31666403. The next prime is 31666477. The reversal of 31666423 is 32466613.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31666423 is a prime.

It is a super-2 number, since 2×31666423² = 2005524691229858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31666403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4315 + ... + 9052.

It is an arithmetic number, because the mean of its divisors is an integer number (4170816).

Almost surely, 2^31666423 is an apocalyptic number.

31666423 is a deficient number, since it is larger than the sum of its proper divisors (1700105).

31666423 is a wasteful number, since it uses less digits than its factorization.

31666423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13493.

The product of its digits is 15552, while the sum is 31.

The square root of 31666423 is about 5627.2926883182. The cubic root of 31666423 is about 316.3731871273.

The spelling of 31666423 in words is "thirty-one million, six hundred sixty-six thousand, four hundred twenty-three".