31555236241 has 4 divisors (see below), whose sum is σ = 31767016500. Its totient is φ = 31343455984.

The previous prime is 31555236221. The next prime is 31555236253. The reversal of 31555236241 is 14263255513.

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 3287875600 + 28267360641 = 57340^2 + 168129^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31555236241 is a prime.

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 31555236241.

It is not an unprimeable number, because it can be changed into a prime (31555236211) 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, 105889906 + ... + 105890203.

It is an arithmetic number, because the mean of its divisors is an integer number (7941754125).

Almost surely, 2^31555236241 is an apocalyptic number.

It is an amenable number.

31555236241 is a deficient number, since it is larger than the sum of its proper divisors (211780259).

31555236241 is a wasteful number, since it uses less digits than its factorization.

31555236241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211780258.

The product of its digits is 108000, while the sum is 37.

The spelling of 31555236241 in words is "thirty-one billion, five hundred fifty-five million, two hundred thirty-six thousand, two hundred forty-one".