31012013233 has 4 divisors (see below), whose sum is σ = 31220147700. Its totient is φ = 30803878768.

The previous prime is 31012013209. The next prime is 31012013261. The reversal of 31012013233 is 33231021013.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33231021013 = 2707 ⋅12275959.

It can be written as a sum of positive squares in 2 ways, for example, as 4809145104 + 26202868129 = 69348^2 + 161873^2 .

It is a cyclic number.

It is not a de Polignac number, because 31012013233 - 2²⁵ = 30978458801 is a prime.

It is a super-2 number, since 2×31012013233² (a number of 22 digits) contains 22 as substring.

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 31012013233.

It is not an unprimeable number, because it can be changed into a prime (31012013293) 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, 104067010 + ... + 104067307.

It is an arithmetic number, because the mean of its divisors is an integer number (7805036925).

Almost surely, 2^31012013233 is an apocalyptic number.

It is an amenable number.

31012013233 is a deficient number, since it is larger than the sum of its proper divisors (208134467).

31012013233 is a wasteful number, since it uses less digits than its factorization.

31012013233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208134466.

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

Adding to 31012013233 its reverse (33231021013), we get a palindrome (64243034246).

The spelling of 31012013233 in words is "thirty-one billion, twelve million, thirteen thousand, two hundred thirty-three".