2638934621 has 2 divisors, whose sum is σ = 2638934622. Its totient is φ = 2638934620.

The previous prime is 2638934611. The next prime is 2638934677. The reversal of 2638934621 is 1264398362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2406981721 + 231952900 = 49061^2 + 15230^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638934621 - 2¹⁴ = 2638918237 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2638934611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319467310 + 1319467311.

It is an arithmetic number, because the mean of its divisors is an integer number (1319467311).

Almost surely, 2^2638934621 is an apocalyptic number.

It is an amenable number.

2638934621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638934621 is an equidigital number, since it uses as much as digits as its factorization.

2638934621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 373248, while the sum is 44.

The square root of 2638934621 is about 51370.5618131630. The cubic root of 2638934621 is about 1381.8987063467.

The spelling of 2638934621 in words is "two billion, six hundred thirty-eight million, nine hundred thirty-four thousand, six hundred twenty-one".