82126391 has 2 divisors, whose sum is σ = 82126392. Its totient is φ = 82126390.

The previous prime is 82126381. The next prime is 82126393. The reversal of 82126391 is 19362128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82126391 - 2⁶ = 82126327 is a prime.

Together with 82126393, 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 (82126393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41063195 + 41063196.

It is an arithmetic number, because the mean of its divisors is an integer number (41063196).

Almost surely, 2^82126391 is an apocalyptic number.

82126391 is a deficient number, since it is larger than the sum of its proper divisors (1).

82126391 is an equidigital number, since it uses as much as digits as its factorization.

82126391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 32.

The square root of 82126391 is about 9062.3612265237. The cubic root of 82126391 is about 434.6712467395.

The spelling of 82126391 in words is "eighty-two million, one hundred twenty-six thousand, three hundred ninety-one".