31142990 has 8 divisors (see below), whose sum is σ = 56057400. Its totient is φ = 12457192.

The previous prime is 31142987. The next prime is 31143017. The reversal of 31142990 is 9924113.

It is a happy number.

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

It is a super-2 number, since 2×31142990² = 1939771652280200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1557140 + ... + 1557159.

It is an arithmetic number, because the mean of its divisors is an integer number (7007175).

Almost surely, 2^31142990 is an apocalyptic number.

31142990 is a deficient number, since it is larger than the sum of its proper divisors (24914410).

31142990 is a wasteful number, since it uses less digits than its factorization.

31142990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3114306.

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 31142990 is about 5580.5904705506. The cubic root of 31142990 is about 314.6203202373.

The spelling of 31142990 in words is "thirty-one million, one hundred forty-two thousand, nine hundred ninety".