2780833621 has 2 divisors, whose sum is σ = 2780833622. Its totient is φ = 2780833620.

The previous prime is 2780833619. The next prime is 2780833663. The reversal of 2780833621 is 1263380872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2121063025 + 659770596 = 46055^2 + 25686^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780833621 - 2¹ = 2780833619 is a prime.

Together with 2780833619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2780833721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390416810 + 1390416811.

It is an arithmetic number, because the mean of its divisors is an integer number (1390416811).

Almost surely, 2^2780833621 is an apocalyptic number.

It is an amenable number.

2780833621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780833621 is an equidigital number, since it uses as much as digits as its factorization.

2780833621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 40.

The square root of 2780833621 is about 52733.6099750434. The cubic root of 2780833621 is about 1406.2363995234.

The spelling of 2780833621 in words is "two billion, seven hundred eighty million, eight hundred thirty-three thousand, six hundred twenty-one".