2731390621 has 2 divisors, whose sum is σ = 2731390622. Its totient is φ = 2731390620.

The previous prime is 2731390609. The next prime is 2731390667. The reversal of 2731390621 is 1260931372.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2214737721 + 516652900 = 47061^2 + 22730^2 .

It is a cyclic number.

It is not a de Polignac number, because 2731390621 - 2⁵ = 2731390589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2731390601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1365695310 + 1365695311.

It is an arithmetic number, because the mean of its divisors is an integer number (1365695311).

Almost surely, 2^2731390621 is an apocalyptic number.

It is an amenable number.

2731390621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2731390621 is an equidigital number, since it uses as much as digits as its factorization.

2731390621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 2731390621 is about 52262.7077465376. The cubic root of 2731390621 is about 1397.8522546095.

The spelling of 2731390621 in words is "two billion, seven hundred thirty-one million, three hundred ninety thousand, six hundred twenty-one".