2631058721 has 2 divisors, whose sum is σ = 2631058722. Its totient is φ = 2631058720.

The previous prime is 2631058693. The next prime is 2631058741. The reversal of 2631058721 is 1278501362.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2241549025 + 389509696 = 47345^2 + 19736^2 .

It is a cyclic number.

It is not a de Polignac number, because 2631058721 - 2²² = 2626864417 is a prime.

It is not a weakly prime, because it can be changed into another prime (2631058741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1315529360 + 1315529361.

It is an arithmetic number, because the mean of its divisors is an integer number (1315529361).

Almost surely, 2^2631058721 is an apocalyptic number.

It is an amenable number.

2631058721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2631058721 is an equidigital number, since it uses as much as digits as its factorization.

2631058721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 2631058721 is about 51293.8468142135. The cubic root of 2631058721 is about 1380.5225775880.

The spelling of 2631058721 in words is "two billion, six hundred thirty-one million, fifty-eight thousand, seven hundred twenty-one".