2631240857 has 6 divisors (see below), whose sum is σ = 3060831258. Its totient is φ = 2255349264.

The previous prime is 2631240839. The next prime is 2631240881. The reversal of 2631240857 is 7580421362.

It is a happy number.

2631240857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2368184896 + 263055961 = 48664^2 + 16219^2 .

It is not a de Polignac number, because 2631240857 - 2⁶ = 2631240793 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 2631240857.

It is not an unprimeable number, because it can be changed into a prime (2631140857) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26849348 + ... + 26849445.

It is an arithmetic number, because the mean of its divisors is an integer number (510138543).

Almost surely, 2^2631240857 is an apocalyptic number.

It is an amenable number.

2631240857 is a deficient number, since it is larger than the sum of its proper divisors (429590401).

2631240857 is an equidigital number, since it uses as much as digits as its factorization.

2631240857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53698807 (or 53698800 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 2631240857 is about 51295.6222011197. The cubic root of 2631240857 is about 1380.5544325793.

The spelling of 2631240857 in words is "two billion, six hundred thirty-one million, two hundred forty thousand, eight hundred fifty-seven".