31325990 has 8 divisors (see below), whose sum is σ = 56386800. Its totient is φ = 12530392.

The previous prime is 31325989. The next prime is 31325999. The reversal of 31325990 is 9952313.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31325999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1566290 + ... + 1566309.

It is an arithmetic number, because the mean of its divisors is an integer number (7048350).

Almost surely, 2^31325990 is an apocalyptic number.

31325990 is a deficient number, since it is larger than the sum of its proper divisors (25060810).

31325990 is a wasteful number, since it uses less digits than its factorization.

31325990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3132606.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 31325990 is about 5596.9625691084. The cubic root of 31325990 is about 315.2353662100.

It can be divided in two parts, 31325 and 990, that multiplied together give a triangular number (31011750 = T₇₈₇₅).

The spelling of 31325990 in words is "thirty-one million, three hundred twenty-five thousand, nine hundred ninety".