31555144133 has 4 divisors (see below), whose sum is σ = 33411329100. Its totient is φ = 29698959168.

The previous prime is 31555144111. The next prime is 31555144139. The reversal of 31555144133 is 33144155513.

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 11990688004 + 19564456129 = 109502^2 + 139873^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31555144133 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31555144093 and 31555144102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31555144139) 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, 928092458 + ... + 928092491.

It is an arithmetic number, because the mean of its divisors is an integer number (8352832275).

Almost surely, 2^31555144133 is an apocalyptic number.

It is an amenable number.

31555144133 is a deficient number, since it is larger than the sum of its proper divisors (1856184967).

31555144133 is a wasteful number, since it uses less digits than its factorization.

31555144133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856184966.

The product of its digits is 54000, while the sum is 35.

Adding to 31555144133 its reverse (33144155513), we get a palindrome (64699299646).

The spelling of 31555144133 in words is "thirty-one billion, five hundred fifty-five million, one hundred forty-four thousand, one hundred thirty-three".