2543555801 has 2 divisors, whose sum is σ = 2543555802. Its totient is φ = 2543555800.

The previous prime is 2543555789. The next prime is 2543555843. The reversal of 2543555801 is 1085553452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1513210000 + 1030345801 = 38900^2 + 32099^2 .

It is a cyclic number.

It is not a de Polignac number, because 2543555801 - 2¹⁴ = 2543539417 is a prime.

It is a super-2 number, since 2×2543555801² = 12939352225601503202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2543555881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271777900 + 1271777901.

It is an arithmetic number, because the mean of its divisors is an integer number (1271777901).

Almost surely, 2^2543555801 is an apocalyptic number.

It is an amenable number.

2543555801 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543555801 is an equidigital number, since it uses as much as digits as its factorization.

2543555801 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120000, while the sum is 38.

The square root of 2543555801 is about 50433.6772504246. The cubic root of 2543555801 is about 1365.0453814518.

The spelling of 2543555801 in words is "two billion, five hundred forty-three million, five hundred fifty-five thousand, eight hundred one".