2541455821 has 2 divisors, whose sum is σ = 2541455822. Its totient is φ = 2541455820.

The previous prime is 2541455809. The next prime is 2541455831. The reversal of 2541455821 is 1285541452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2121615721 + 419840100 = 46061^2 + 20490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2541455821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2541455831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1270727910 + 1270727911.

It is an arithmetic number, because the mean of its divisors is an integer number (1270727911).

Almost surely, 2^2541455821 is an apocalyptic number.

It is an amenable number.

2541455821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2541455821 is an equidigital number, since it uses as much as digits as its factorization.

2541455821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64000, while the sum is 37.

The square root of 2541455821 is about 50412.8537279928. The cubic root of 2541455821 is about 1364.6696138946.

The spelling of 2541455821 in words is "two billion, five hundred forty-one million, four hundred fifty-five thousand, eight hundred twenty-one".