31030013131 has 4 divisors (see below), whose sum is σ = 33416937232. Its totient is φ = 28643089032.

The previous prime is 31030013101. The next prime is 31030013213. The reversal of 31030013131 is 13131003013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31030013131 - 2²³ = 31021624523 is a prime.

It is a super-2 number, since 2×31030013131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31030013101) 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, 1193462031 + ... + 1193462056.

It is an arithmetic number, because the mean of its divisors is an integer number (8354234308).

Almost surely, 2^31030013131 is an apocalyptic number.

31030013131 is a deficient number, since it is larger than the sum of its proper divisors (2386924101).

31030013131 is a wasteful number, since it uses less digits than its factorization.

31030013131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2386924100.

The product of its (nonzero) digits is 81, while the sum is 16.

Adding to 31030013131 its reverse (13131003013), we get a palindrome (44161016144).

The spelling of 31030013131 in words is "thirty-one billion, thirty million, thirteen thousand, one hundred thirty-one".