2131559977 has 4 divisors (see below), whose sum is σ = 2256945876. Its totient is φ = 2006174080.

The previous prime is 2131559959. The next prime is 2131560007. The reversal of 2131559977 is 7799551312.

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 1362274281 + 769285696 = 36909^2 + 27736^2 .

It is not a de Polignac number, because 2131559977 - 2⁷ = 2131559849 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 2131559977.

It is not an unprimeable number, because it can be changed into a prime (2131559957) 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, 62692924 + ... + 62692957.

It is an arithmetic number, because the mean of its divisors is an integer number (564236469).

Almost surely, 2^2131559977 is an apocalyptic number.

It is an amenable number.

2131559977 is a deficient number, since it is larger than the sum of its proper divisors (125385899).

2131559977 is a wasteful number, since it uses less digits than its factorization.

2131559977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125385898.

The product of its digits is 595350, while the sum is 49.

The square root of 2131559977 is about 46168.8203986197. The cubic root of 2131559977 is about 1286.9623812762.

The spelling of 2131559977 in words is "two billion, one hundred thirty-one million, five hundred fifty-nine thousand, nine hundred seventy-seven".