2139539 has 2 divisors, whose sum is σ = 2139540. Its totient is φ = 2139538.

The previous prime is 2139521. The next prime is 2139541. The reversal of 2139539 is 9359312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2139539 - 2⁸ = 2139283 is a prime.

Together with 2139541, 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 (2130539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069769 + 1069770.

It is an arithmetic number, because the mean of its divisors is an integer number (1069770).

2^2139539 is an apocalyptic number.

2139539 is a deficient number, since it is larger than the sum of its proper divisors (1).

2139539 is an equidigital number, since it uses as much as digits as its factorization.

2139539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290, while the sum is 32.

The square root of 2139539 is about 1462.7163087899. The cubic root of 2139539 is about 128.8566201367.

It can be divided in two parts, 2139 and 539, that multiplied together give a triangular number (1152921 = T₁₅₁₈).

The spelling of 2139539 in words is "two million, one hundred thirty-nine thousand, five hundred thirty-nine".