31299138 has 36 divisors (see below), whose sum is σ = 73439730. Its totient is φ = 9629568.

The previous prime is 31299131. The next prime is 31299179. The reversal of 31299138 is 83199213.

It can be written as a sum of positive squares in 3 ways, for example, as 22496049 + 8803089 = 4743^2 + 2967^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (31299131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2103 + ... + 8186.

Almost surely, 2^31299138 is an apocalyptic number.

31299138 is an abundant number, since it is smaller than the sum of its proper divisors (42140592).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31299138 is a wasteful number, since it uses less digits than its factorization.

31299138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10323 (or 10307 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 31299138 is about 5594.5632537313. The cubic root of 31299138 is about 315.1452693522.

The spelling of 31299138 in words is "thirty-one million, two hundred ninety-nine thousand, one hundred thirty-eight".