2631997809 has 45 divisors (see below), whose sum is σ = 4447884363. Its totient is φ = 1499689296.

The previous prime is 2631997759. The next prime is 2631997843. The reversal of 2631997809 is 9087991362.

The square root of 2631997809 is 51303.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1931866209 + 700131600 = 43953^2 + 26460^2 .

It is not a de Polignac number, because 2631997809 - 2²¹ = 2629900657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2631997859) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 7541367 + ... + 7541715.

Almost surely, 2^2631997809 is an apocalyptic number.

2631997809 is the 51303-rd square number.

2631997809 is the 25652-nd centered octagonal number.

It is an amenable number.

2631997809 is a deficient number, since it is larger than the sum of its proper divisors (1815886554).

2631997809 is an frugal number, since it uses more digits than its factorization.

2631997809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732 (or 359 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The cubic root of 2631997809 is about 1380.6868052636.

The spelling of 2631997809 in words is "two billion, six hundred thirty-one million, nine hundred ninety-seven thousand, eight hundred nine".