84997973 has 2 divisors, whose sum is σ = 84997974. Its totient is φ = 84997972.

The previous prime is 84997933. The next prime is 84997987. The reversal of 84997973 is 37979948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74252689 + 10745284 = 8617^2 + 3278^2 .

It is a cyclic number.

It is not a de Polignac number, because 84997973 - 2¹⁰ = 84996949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84997933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42498986 + 42498987.

It is an arithmetic number, because the mean of its divisors is an integer number (42498987).

Almost surely, 2^84997973 is an apocalyptic number.

It is an amenable number.

84997973 is a deficient number, since it is larger than the sum of its proper divisors (1).

84997973 is an equidigital number, since it uses as much as digits as its factorization.

84997973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 56.

The square root of 84997973 is about 9219.4345271280. The cubic root of 84997973 is about 439.6794721395.

The spelling of 84997973 in words is "eighty-four million, nine hundred ninety-seven thousand, nine hundred seventy-three".