84861479 has 2 divisors, whose sum is σ = 84861480. Its totient is φ = 84861478.

The previous prime is 84861473. The next prime is 84861481. The reversal of 84861479 is 97416848.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84861479 - 2²⁰ = 83812903 is a prime.

It is a super-3 number, since 3×84861479³ (a number of 25 digits) contains 333 as substring.

Together with 84861481, 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 (84861473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42430739 + 42430740.

It is an arithmetic number, because the mean of its divisors is an integer number (42430740).

Almost surely, 2^84861479 is an apocalyptic number.

84861479 is a deficient number, since it is larger than the sum of its proper divisors (1).

84861479 is an equidigital number, since it uses as much as digits as its factorization.

84861479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 387072, while the sum is 47.

The square root of 84861479 is about 9212.0290381653. The cubic root of 84861479 is about 439.4439929442.

The spelling of 84861479 in words is "eighty-four million, eight hundred sixty-one thousand, four hundred seventy-nine".