2631318761 has 4 divisors (see below), whose sum is σ = 2657371524. Its totient is φ = 2605266000.

The previous prime is 2631318707. The next prime is 2631318763. The reversal of 2631318761 is 1678131362.

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 2564814736 + 66504025 = 50644^2 + 8155^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2631318761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2631318763) 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, 13026230 + ... + 13026431.

It is an arithmetic number, because the mean of its divisors is an integer number (664342881).

Almost surely, 2^2631318761 is an apocalyptic number.

It is an amenable number.

2631318761 is a deficient number, since it is larger than the sum of its proper divisors (26052763).

2631318761 is a wasteful number, since it uses less digits than its factorization.

2631318761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26052762.

The product of its digits is 36288, while the sum is 38.

The square root of 2631318761 is about 51296.3815585466. The cubic root of 2631318761 is about 1380.5680572856.

The spelling of 2631318761 in words is "two billion, six hundred thirty-one million, three hundred eighteen thousand, seven hundred sixty-one".