2543624891 has 2 divisors, whose sum is σ = 2543624892. Its totient is φ = 2543624890.

The previous prime is 2543624869. The next prime is 2543624899. The reversal of 2543624891 is 1984263452.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2543624891 - 2²⁶ = 2476516027 is a prime.

It is a super-2 number, since 2×2543624891² = 12940055172229523762, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2543624899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1271812445 + 1271812446.

It is an arithmetic number, because the mean of its divisors is an integer number (1271812446).

Almost surely, 2^2543624891 is an apocalyptic number.

2543624891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2543624891 is an equidigital number, since it uses as much as digits as its factorization.

2543624891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 414720, while the sum is 44.

The square root of 2543624891 is about 50434.3622047508. The cubic root of 2543624891 is about 1365.0577408073.

The spelling of 2543624891 in words is "two billion, five hundred forty-three million, six hundred twenty-four thousand, eight hundred ninety-one".