2797191821 has 2 divisors, whose sum is σ = 2797191822. Its totient is φ = 2797191820.

The previous prime is 2797191791. The next prime is 2797191827. The reversal of 2797191821 is 1281917972.

2797191821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1765176196 + 1032015625 = 42014^2 + 32125^2 .

It is a cyclic number.

It is not a de Polignac number, because 2797191821 - 2³⁰ = 1723449997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2797191827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1398595910 + 1398595911.

It is an arithmetic number, because the mean of its divisors is an integer number (1398595911).

Almost surely, 2^2797191821 is an apocalyptic number.

It is an amenable number.

2797191821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2797191821 is an equidigital number, since it uses as much as digits as its factorization.

2797191821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 127008, while the sum is 47.

The square root of 2797191821 is about 52888.4847674803. The cubic root of 2797191821 is about 1408.9883965093.

The spelling of 2797191821 in words is "two billion, seven hundred ninety-seven million, one hundred ninety-one thousand, eight hundred twenty-one".