31666143 has 8 divisors (see below), whose sum is σ = 42851968. Its totient is φ = 20795544.

The previous prime is 31666139. The next prime is 31666157. The reversal of 31666143 is 34166613.

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

It is not a de Polignac number, because 31666143 - 2² = 31666139 is a prime.

It is a super-2 number, since 2×31666143² = 2005489224992898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31666143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31666133) 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, 78571 + ... + 78972.

It is an arithmetic number, because the mean of its divisors is an integer number (5356496).

Almost surely, 2^31666143 is an apocalyptic number.

31666143 is a deficient number, since it is larger than the sum of its proper divisors (11185825).

31666143 is a wasteful number, since it uses less digits than its factorization.

31666143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157613.

The product of its digits is 7776, while the sum is 30.

The square root of 31666143 is about 5627.2678095147. The cubic root of 31666143 is about 316.3722546491.

The spelling of 31666143 in words is "thirty-one million, six hundred sixty-six thousand, one hundred forty-three".