31143986 has 8 divisors (see below), whose sum is σ = 47710080. Its totient is φ = 15240628.

The previous prime is 31143971. The next prime is 31144027. The reversal of 31143986 is 68934113.

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

It is an unprimeable number.

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, 165566 + ... + 165753.

It is an arithmetic number, because the mean of its divisors is an integer number (5963760).

Almost surely, 2^31143986 is an apocalyptic number.

31143986 is a deficient number, since it is larger than the sum of its proper divisors (16566094).

31143986 is a wasteful number, since it uses less digits than its factorization.

31143986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331368.

The product of its digits is 15552, while the sum is 35.

The square root of 31143986 is about 5580.6797077059. The cubic root of 31143986 is about 314.6236742130.

The spelling of 31143986 in words is "thirty-one million, one hundred forty-three thousand, nine hundred eighty-six".