31083055561 has 4 divisors (see below), whose sum is σ = 32911470612. Its totient is φ = 29254640512.

The previous prime is 31083055559. The next prime is 31083055579. The reversal of 31083055561 is 16555038013.

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 28180001161 + 2903054400 = 167869^2 + 53880^2 .

It is a cyclic number.

It is not a de Polignac number, because 31083055561 - 2¹ = 31083055559 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 31083055561.

It is not an unprimeable number, because it can be changed into a prime (31083055501) 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, 914207500 + ... + 914207533.

It is an arithmetic number, because the mean of its divisors is an integer number (8227867653).

Almost surely, 2^31083055561 is an apocalyptic number.

It is an amenable number.

31083055561 is a deficient number, since it is larger than the sum of its proper divisors (1828415051).

31083055561 is a wasteful number, since it uses less digits than its factorization.

31083055561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828415050.

The product of its (nonzero) digits is 54000, while the sum is 37.

The spelling of 31083055561 in words is "thirty-one billion, eighty-three million, fifty-five thousand, five hundred sixty-one".