31032310213 has 4 divisors (see below), whose sum is σ = 31056386220. Its totient is φ = 31008234208.

The previous prime is 31032310129. The next prime is 31032310223. The reversal of 31032310213 is 31201323013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31201323013 = 7 ⋅4457331859.

It can be written as a sum of positive squares in 2 ways, for example, as 21809973124 + 9222337089 = 147682^2 + 96033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31032310213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31032310223) 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, 12036070 + ... + 12038647.

It is an arithmetic number, because the mean of its divisors is an integer number (7764096555).

Almost surely, 2^31032310213 is an apocalyptic number.

It is an amenable number.

31032310213 is a deficient number, since it is larger than the sum of its proper divisors (24076007).

31032310213 is a wasteful number, since it uses less digits than its factorization.

31032310213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24076006.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 31032310213 its reverse (31201323013), we get a palindrome (62233633226).

The spelling of 31032310213 in words is "thirty-one billion, thirty-two million, three hundred ten thousand, two hundred thirteen".