31327993 has 4 divisors (see below), whose sum is σ = 31651060. Its totient is φ = 31004928.

The previous prime is 31327987. The next prime is 31327999. The reversal of 31327993 is 39972313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39972313 = 1019 ⋅39227.

It is an interprime number because it is at equal distance from previous prime (31327987) and next prime (31327999).

It can be written as a sum of positive squares in 2 ways, for example, as 9162729 + 22165264 = 3027^2 + 4708^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31327993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31327999) 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, 161388 + ... + 161581.

It is an arithmetic number, because the mean of its divisors is an integer number (7912765).

Almost surely, 2^31327993 is an apocalyptic number.

It is an amenable number.

31327993 is a deficient number, since it is larger than the sum of its proper divisors (323067).

31327993 is an equidigital number, since it uses as much as digits as its factorization.

31327993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323066.

The product of its digits is 30618, while the sum is 37.

The square root of 31327993 is about 5597.1415025886. The cubic root of 31327993 is about 315.2420848376.

The spelling of 31327993 in words is "thirty-one million, three hundred twenty-seven thousand, nine hundred ninety-three".