31359544561 has 4 divisors (see below), whose sum is σ = 31360198900. Its totient is φ = 31358890224.

The previous prime is 31359544483. The next prime is 31359544577. The reversal of 31359544561 is 16544595313.

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 17838273600 + 13521270961 = 133560^2 + 116281^2 .

It is a cyclic number.

It is not a de Polignac number, because 31359544561 - 2¹⁵ = 31359511793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31359544861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249066 + ... + 353203.

It is an arithmetic number, because the mean of its divisors is an integer number (7840049725).

Almost surely, 2^31359544561 is an apocalyptic number.

It is an amenable number.

31359544561 is a deficient number, since it is larger than the sum of its proper divisors (654339).

31359544561 is an equidigital number, since it uses as much as digits as its factorization.

31359544561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654338.

The product of its digits is 972000, while the sum is 46.

The spelling of 31359544561 in words is "thirty-one billion, three hundred fifty-nine million, five hundred forty-four thousand, five hundred sixty-one".