31322990 has 8 divisors (see below), whose sum is σ = 56381400. Its totient is φ = 12529192.

The previous prime is 31322983. The next prime is 31323023. The reversal of 31322990 is 9922313.

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

It is a super-2 number, since 2×31322990² = 1962259405080200, which contains 22 as substring.

It is a Curzon number.

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, 1566140 + ... + 1566159.

It is an arithmetic number, because the mean of its divisors is an integer number (7047675).

Almost surely, 2^31322990 is an apocalyptic number.

31322990 is a deficient number, since it is larger than the sum of its proper divisors (25058410).

31322990 is a wasteful number, since it uses less digits than its factorization.

31322990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132306.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 31322990 is about 5596.6945601846. The cubic root of 31322990 is about 315.2253028272.

The spelling of 31322990 in words is "thirty-one million, three hundred twenty-two thousand, nine hundred ninety".