82156439 has 2 divisors, whose sum is σ = 82156440. Its totient is φ = 82156438.

The previous prime is 82156421. The next prime is 82156441. The reversal of 82156439 is 93465128.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82156439 - 2⁸ = 82156183 is a prime.

Together with 82156441, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82156409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41078219 + 41078220.

It is an arithmetic number, because the mean of its divisors is an integer number (41078220).

Almost surely, 2^82156439 is an apocalyptic number.

82156439 is a deficient number, since it is larger than the sum of its proper divisors (1).

82156439 is an equidigital number, since it uses as much as digits as its factorization.

82156439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 82156439 is about 9064.0189209864. The cubic root of 82156439 is about 434.7242520681.

The spelling of 82156439 in words is "eighty-two million, one hundred fifty-six thousand, four hundred thirty-nine".