31299213 has 16 divisors (see below), whose sum is σ = 47923200. Its totient is φ = 17970480.

The previous prime is 31299199. The next prime is 31299221.

It is a happy number.

31299213 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31299213 - 2⁴ = 31299197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31299223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24333 + ... + 25586.

It is an arithmetic number, because the mean of its divisors is an integer number (2995200).

Almost surely, 2^31299213 is an apocalyptic number.

31299213 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31299213 is a deficient number, since it is larger than the sum of its proper divisors (16623987).

31299213 is a wasteful number, since it uses less digits than its factorization.

31299213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49952.

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

The square root of 31299213 is about 5594.5699566633. The cubic root of 31299213 is about 315.1455210724.

The spelling of 31299213 in words is "thirty-one million, two hundred ninety-nine thousand, two hundred thirteen".