84457291 has 2 divisors, whose sum is σ = 84457292. Its totient is φ = 84457290.

The previous prime is 84457283. The next prime is 84457297. The reversal of 84457291 is 19275448.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 84457291 - 2³ = 84457283 is a prime.

It is not a weakly prime, because it can be changed into another prime (84457297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42228645 + 42228646.

It is an arithmetic number, because the mean of its divisors is an integer number (42228646).

Almost surely, 2^84457291 is an apocalyptic number.

84457291 is a deficient number, since it is larger than the sum of its proper divisors (1).

84457291 is an equidigital number, since it uses as much as digits as its factorization.

84457291 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 84457291 is about 9190.0647984658. The cubic root of 84457291 is about 438.7452042343.

It can be divided in two parts, 84457 and 291, that added together give a palindrome (84748).

The spelling of 84457291 in words is "eighty-four million, four hundred fifty-seven thousand, two hundred ninety-one".