2635538921 has 2 divisors, whose sum is σ = 2635538922. Its totient is φ = 2635538920.

The previous prime is 2635538891. The next prime is 2635538953. The reversal of 2635538921 is 1298355362.

2635538921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2434040896 + 201498025 = 49336^2 + 14195^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2635538921 is a prime.

It is not a weakly prime, because it can be changed into another prime (2635508921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1317769460 + 1317769461.

It is an arithmetic number, because the mean of its divisors is an integer number (1317769461).

Almost surely, 2^2635538921 is an apocalyptic number.

It is an amenable number.

2635538921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2635538921 is an equidigital number, since it uses as much as digits as its factorization.

2635538921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 388800, while the sum is 44.

The square root of 2635538921 is about 51337.5001436572. The cubic root of 2635538921 is about 1381.3057236625.

The spelling of 2635538921 in words is "two billion, six hundred thirty-five million, five hundred thirty-eight thousand, nine hundred twenty-one".