31023222133 has 4 divisors (see below), whose sum is σ = 31073503500. Its totient is φ = 30972940768.

The previous prime is 31023222121. The next prime is 31023222199. The reversal of 31023222133 is 33122232013.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16609538884 + 14413683249 = 128878^2 + 120057^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31023222133 is a prime.

It is a super-2 number, since 2×31023222133² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023222233) 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, 25139758 + ... + 25140991.

It is an arithmetic number, because the mean of its divisors is an integer number (7768375875).

Almost surely, 2^31023222133 is an apocalyptic number.

It is an amenable number.

31023222133 is a deficient number, since it is larger than the sum of its proper divisors (50281367).

31023222133 is an equidigital number, since it uses as much as digits as its factorization.

31023222133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50281366.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 31023222133 its reverse (33122232013), we get a palindrome (64145454146).

The spelling of 31023222133 in words is "thirty-one billion, twenty-three million, two hundred twenty-two thousand, one hundred thirty-three".