2139528491 has 2 divisors, whose sum is σ = 2139528492. Its totient is φ = 2139528490.

The previous prime is 2139528439. The next prime is 2139528493. The reversal of 2139528491 is 1948259312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2139528491 - 2⁶ = 2139528427 is a prime.

It is a Sophie Germain prime.

Together with 2139528493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2139528493) 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, 1069764245 + 1069764246.

It is an arithmetic number, because the mean of its divisors is an integer number (1069764246).

Almost surely, 2^2139528491 is an apocalyptic number.

2139528491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139528491 is an equidigital number, since it uses as much as digits as its factorization.

2139528491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 44.

The square root of 2139528491 is about 46255.0374662047. The cubic root of 2139528491 is about 1288.5640916346.

The spelling of 2139528491 in words is "two billion, one hundred thirty-nine million, five hundred twenty-eight thousand, four hundred ninety-one".