31212993 has 8 divisors (see below), whose sum is σ = 47562688. Its totient is φ = 17835984.

The previous prime is 31212899. The next prime is 31213009. The reversal of 31212993 is 39921213.

It is a happy number.

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

It is not a de Polignac number, because 31212993 - 2¹⁸ = 30950849 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31212993.

It is not an unprimeable number, because it can be changed into a prime (31211993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 743146 + ... + 743187.

It is an arithmetic number, because the mean of its divisors is an integer number (5945336).

Almost surely, 2^31212993 is an apocalyptic number.

It is an amenable number.

31212993 is a deficient number, since it is larger than the sum of its proper divisors (16349695).

31212993 is a wasteful number, since it uses less digits than its factorization.

31212993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486343.

The product of its digits is 2916, while the sum is 30.

The square root of 31212993 is about 5586.8589565157. The cubic root of 31212993 is about 314.8558776322.

The spelling of 31212993 in words is "thirty-one million, two hundred twelve thousand, nine hundred ninety-three".