84779897 has 2 divisors, whose sum is σ = 84779898. Its totient is φ = 84779896.

The previous prime is 84779879. The next prime is 84779927. The reversal of 84779897 is 79897748.

Together with previous prime (84779879) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59969536 + 24810361 = 7744^2 + 4981^2 .

It is a cyclic number.

It is not a de Polignac number, because 84779897 - 2²⁰ = 83731321 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84779837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42389948 + 42389949.

It is an arithmetic number, because the mean of its divisors is an integer number (42389949).

Almost surely, 2^84779897 is an apocalyptic number.

It is an amenable number.

84779897 is a deficient number, since it is larger than the sum of its proper divisors (1).

84779897 is an equidigital number, since it uses as much as digits as its factorization.

84779897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7112448, while the sum is 59.

The square root of 84779897 is about 9207.5999587297. The cubic root of 84779897 is about 439.3031272463.

The spelling of 84779897 in words is "eighty-four million, seven hundred seventy-nine thousand, eight hundred ninety-seven".