84971849 has 2 divisors, whose sum is σ = 84971850. Its totient is φ = 84971848.

The previous prime is 84971839. The next prime is 84971851. The reversal of 84971849 is 94817948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76877824 + 8094025 = 8768^2 + 2845^2 .

It is a cyclic number.

It is not a de Polignac number, because 84971849 - 2⁴ = 84971833 is a prime.

Together with 84971851, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 84971797 and 84971806.

It is not a weakly prime, because it can be changed into another prime (84971839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42485924 + 42485925.

It is an arithmetic number, because the mean of its divisors is an integer number (42485925).

Almost surely, 2^84971849 is an apocalyptic number.

It is an amenable number.

84971849 is a deficient number, since it is larger than the sum of its proper divisors (1).

84971849 is an equidigital number, since it uses as much as digits as its factorization.

84971849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 50.

The square root of 84971849 is about 9218.0176285360. The cubic root of 84971849 is about 439.6344225810.

The spelling of 84971849 in words is "eighty-four million, nine hundred seventy-one thousand, eight hundred forty-nine".