31170493 has 2 divisors, whose sum is σ = 31170494. Its totient is φ = 31170492.

The previous prime is 31170481. The next prime is 31170511. The reversal of 31170493 is 39407113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25030009 + 6140484 = 5003^2 + 2478^2 .

It is an emirp because it is prime and its reverse (39407113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31170493 - 2⁹ = 31169981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31170443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15585246 + 15585247.

It is an arithmetic number, because the mean of its divisors is an integer number (15585247).

Almost surely, 2^31170493 is an apocalyptic number.

It is an amenable number.

31170493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31170493 is an equidigital number, since it uses as much as digits as its factorization.

31170493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 31170493 is about 5583.0540925196. The cubic root of 31170493 is about 314.7129088284.

The spelling of 31170493 in words is "thirty-one million, one hundred seventy thousand, four hundred ninety-three".