84172315 has 4 divisors (see below), whose sum is σ = 101006784. Its totient is φ = 67337848.

The previous prime is 84172279. The next prime is 84172327. The reversal of 84172315 is 51327148.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84172315 - 2¹³ = 84164123 is a prime.

It is a super-2 number, since 2×84172315² = 14169957224918450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8417227 + ... + 8417236.

It is an arithmetic number, because the mean of its divisors is an integer number (25251696).

Almost surely, 2^84172315 is an apocalyptic number.

84172315 is a deficient number, since it is larger than the sum of its proper divisors (16834469).

84172315 is a wasteful number, since it uses less digits than its factorization.

84172315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16834468.

The product of its digits is 6720, while the sum is 31.

The square root of 84172315 is about 9174.5471277878. The cubic root of 84172315 is about 438.2511764496.

The spelling of 84172315 in words is "eighty-four million, one hundred seventy-two thousand, three hundred fifteen".