31325993 has 4 divisors (see below), whose sum is σ = 31337220. Its totient is φ = 31314768.

The previous prime is 31325989. The next prime is 31325999. The reversal of 31325993 is 39952313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39952313 = 3001 ⋅13313.

It can be written as a sum of positive squares in 2 ways, for example, as 15389929 + 15936064 = 3923^2 + 3992^2 .

It is a cyclic number.

It is not a de Polignac number, because 31325993 - 2² = 31325989 is a prime.

It is a Duffinian 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, 2171 + ... + 8207.

It is an arithmetic number, because the mean of its divisors is an integer number (7834305).

Almost surely, 2^31325993 is an apocalyptic number.

It is an amenable number.

31325993 is a deficient number, since it is larger than the sum of its proper divisors (11227).

31325993 is an equidigital number, since it uses as much as digits as its factorization.

31325993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11226.

The product of its digits is 21870, while the sum is 35.

The square root of 31325993 is about 5596.9628371109. The cubic root of 31325993 is about 315.2353762730.

The spelling of 31325993 in words is "thirty-one million, three hundred twenty-five thousand, nine hundred ninety-three".