84128249 has 2 divisors, whose sum is σ = 84128250. Its totient is φ = 84128248.

The previous prime is 84128173. The next prime is 84128251. The reversal of 84128249 is 94282148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48511225 + 35617024 = 6965^2 + 5968^2 .

It is a cyclic number.

It is not a de Polignac number, because 84128249 - 2⁸ = 84127993 is a prime.

Together with 84128251, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84121249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42064124 + 42064125.

It is an arithmetic number, because the mean of its divisors is an integer number (42064125).

Almost surely, 2^84128249 is an apocalyptic number.

It is an amenable number.

84128249 is a deficient number, since it is larger than the sum of its proper divisors (1).

84128249 is an equidigital number, since it uses as much as digits as its factorization.

84128249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 38.

The square root of 84128249 is about 9172.1452779598. The cubic root of 84128249 is about 438.1746851575.

It can be divided in two parts, 8412 and 8249, that added together give a palindrome (16661).

The spelling of 84128249 in words is "eighty-four million, one hundred twenty-eight thousand, two hundred forty-nine".