84909479 has 2 divisors, whose sum is σ = 84909480. Its totient is φ = 84909478.

The previous prime is 84909457. The next prime is 84909481. The reversal of 84909479 is 97490948.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84909479 - 2¹⁶ = 84843943 is a prime.

Together with 84909481, 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 (84909379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42454739 + 42454740.

It is an arithmetic number, because the mean of its divisors is an integer number (42454740).

Almost surely, 2^84909479 is an apocalyptic number.

84909479 is a deficient number, since it is larger than the sum of its proper divisors (1).

84909479 is an equidigital number, since it uses as much as digits as its factorization.

84909479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 84909479 is about 9214.6339590892. The cubic root of 84909479 is about 439.5268312205.

The spelling of 84909479 in words is "eighty-four million, nine hundred nine thousand, four hundred seventy-nine".