82172479 has 2 divisors, whose sum is σ = 82172480. Its totient is φ = 82172478.

The previous prime is 82172437. The next prime is 82172507. The reversal of 82172479 is 97427128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82172479 - 2⁹ = 82171967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82172179) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41086239 + 41086240.

It is an arithmetic number, because the mean of its divisors is an integer number (41086240).

Almost surely, 2^82172479 is an apocalyptic number.

82172479 is a deficient number, since it is larger than the sum of its proper divisors (1).

82172479 is an equidigital number, since it uses as much as digits as its factorization.

82172479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56448, while the sum is 40.

The square root of 82172479 is about 9064.9036950207. The cubic root of 82172479 is about 434.7525416879.

The spelling of 82172479 in words is "eighty-two million, one hundred seventy-two thousand, four hundred seventy-nine".