84515999 has 2 divisors, whose sum is σ = 84516000. Its totient is φ = 84515998.

The previous prime is 84515987. The next prime is 84516001. The reversal of 84515999 is 99951548.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84515999 is a prime.

Together with 84516001, 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 (84515909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42257999 + 42258000.

It is an arithmetic number, because the mean of its divisors is an integer number (42258000).

Almost surely, 2^84515999 is an apocalyptic number.

84515999 is a deficient number, since it is larger than the sum of its proper divisors (1).

84515999 is an equidigital number, since it uses as much as digits as its factorization.

84515999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 583200, while the sum is 50.

The square root of 84515999 is about 9193.2583451136. The cubic root of 84515999 is about 438.8468409598.

The spelling of 84515999 in words is "eighty-four million, five hundred fifteen thousand, nine hundred ninety-nine".