82172047 has 2 divisors, whose sum is σ = 82172048. Its totient is φ = 82172046.

The previous prime is 82172023. The next prime is 82172053. The reversal of 82172047 is 74027128.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 82172047 - 2¹⁹ = 81647759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82170047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41086023 + 41086024.

It is an arithmetic number, because the mean of its divisors is an integer number (41086024).

Almost surely, 2^82172047 is an apocalyptic number.

82172047 is a deficient number, since it is larger than the sum of its proper divisors (1).

82172047 is an equidigital number, since it uses as much as digits as its factorization.

82172047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 31.

The square root of 82172047 is about 9064.8798668267. The cubic root of 82172047 is about 434.7517798212.

The spelling of 82172047 in words is "eighty-two million, one hundred seventy-two thousand, forty-seven".