2644631197 has 18 divisors (see below), whose sum is σ = 3029062778. Its totient is φ = 2294859648.

The previous prime is 2644631179. The next prime is 2644631201. The reversal of 2644631197 is 7911364462.

It can be written as a sum of positive squares in 3 ways, for example, as 591997561 + 2052633636 = 24331^2 + 45306^2 .

It is not a de Polignac number, because 2644631197 - 2¹¹ = 2644629149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2644631137) 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 17 ways as a sum of consecutive naturals, for example, 3151704 + ... + 3152542.

Almost surely, 2^2644631197 is an apocalyptic number.

It is an amenable number.

2644631197 is a deficient number, since it is larger than the sum of its proper divisors (384431581).

2644631197 is an frugal number, since it uses more digits than its factorization.

2644631197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 869 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 2644631197 is about 51425.9778419429. The cubic root of 2644631197 is about 1382.8923438703.

The spelling of 2644631197 in words is "two billion, six hundred forty-four million, six hundred thirty-one thousand, one hundred ninety-seven".