2521947139 has 2 divisors, whose sum is σ = 2521947140. Its totient is φ = 2521947138.

The previous prime is 2521947137. The next prime is 2521947149. The reversal of 2521947139 is 9317491252.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2521947139 - 2¹ = 2521947137 is a prime.

Together with 2521947137, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2521947095 and 2521947104.

It is not a weakly prime, because it can be changed into another prime (2521947137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1260973569 + 1260973570.

It is an arithmetic number, because the mean of its divisors is an integer number (1260973570).

Almost surely, 2^2521947139 is an apocalyptic number.

2521947139 is a deficient number, since it is larger than the sum of its proper divisors (1).

2521947139 is an equidigital number, since it uses as much as digits as its factorization.

2521947139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 43.

The square root of 2521947139 is about 50218.9918158459. The cubic root of 2521947139 is about 1361.1688227230.

The spelling of 2521947139 in words is "two billion, five hundred twenty-one million, nine hundred forty-seven thousand, one hundred thirty-nine".