2521644287 has 2 divisors, whose sum is σ = 2521644288. Its totient is φ = 2521644286.

The previous prime is 2521644233. The next prime is 2521644319. The reversal of 2521644287 is 7824461252.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2521644287 - 2²⁰ = 2520595711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2521644487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260822143 + 1260822144.

It is an arithmetic number, because the mean of its divisors is an integer number (1260822144).

Almost surely, 2^2521644287 is an apocalyptic number.

2521644287 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521644287 is an equidigital number, since it uses as much as digits as its factorization.

2521644287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 41.

The square root of 2521644287 is about 50215.9764118950. The cubic root of 2521644287 is about 1361.1143345068.

The spelling of 2521644287 in words is "two billion, five hundred twenty-one million, six hundred forty-four thousand, two hundred eighty-seven".