84915869 has 2 divisors, whose sum is σ = 84915870. Its totient is φ = 84915868.

The previous prime is 84915847. The next prime is 84915871. The reversal of 84915869 is 96851948.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82992100 + 1923769 = 9110^2 + 1387^2 .

It is a cyclic number.

It is not a de Polignac number, because 84915869 - 2⁸ = 84915613 is a prime.

It is a super-2 number, since 2×84915869² = 14421409616050322, which contains 22 as substring.

Together with 84915871, 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 (84915829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42457934 + 42457935.

It is an arithmetic number, because the mean of its divisors is an integer number (42457935).

Almost surely, 2^84915869 is an apocalyptic number.

It is an amenable number.

84915869 is a deficient number, since it is larger than the sum of its proper divisors (1).

84915869 is an equidigital number, since it uses as much as digits as its factorization.

84915869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 622080, while the sum is 50.

The square root of 84915869 is about 9214.9806836477. The cubic root of 84915869 is about 439.5378567111.

The spelling of 84915869 in words is "eighty-four million, nine hundred fifteen thousand, eight hundred sixty-nine".