84172279 has 2 divisors, whose sum is σ = 84172280. Its totient is φ = 84172278.

The previous prime is 84172271. The next prime is 84172327. The reversal of 84172279 is 97227148.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84172279 - 2³ = 84172271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84172271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42086139 + 42086140.

It is an arithmetic number, because the mean of its divisors is an integer number (42086140).

Almost surely, 2^84172279 is an apocalyptic number.

84172279 is a deficient number, since it is larger than the sum of its proper divisors (1).

84172279 is an equidigital number, since it uses as much as digits as its factorization.

84172279 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 84172279 is about 9174.5451658379. The cubic root of 84172279 is about 438.2511139705.

The spelling of 84172279 in words is "eighty-four million, one hundred seventy-two thousand, two hundred seventy-nine".