2635040621 has 2 divisors, whose sum is σ = 2635040622. Its totient is φ = 2635040620.

The previous prime is 2635040567. The next prime is 2635040623. The reversal of 2635040621 is 1260405362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2634255625 + 784996 = 51325^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 2635040621 - 2⁶ = 2635040557 is a prime.

Together with 2635040623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2635040623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1317520310 + 1317520311.

It is an arithmetic number, because the mean of its divisors is an integer number (1317520311).

Almost surely, 2^2635040621 is an apocalyptic number.

It is an amenable number.

2635040621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2635040621 is an equidigital number, since it uses as much as digits as its factorization.

2635040621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 2635040621 is about 51332.6467367503. The cubic root of 2635040621 is about 1381.2186639192.

Adding to 2635040621 its reverse (1260405362), we get a palindrome (3895445983).

The spelling of 2635040621 in words is "two billion, six hundred thirty-five million, forty thousand, six hundred twenty-one".