84771457 has 2 divisors, whose sum is σ = 84771458. Its totient is φ = 84771456.

The previous prime is 84771451. The next prime is 84771461. The reversal of 84771457 is 75417748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75186241 + 9585216 = 8671^2 + 3096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84771457 is a prime.

It is not a weakly prime, because it can be changed into another prime (84771451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42385728 + 42385729.

It is an arithmetic number, because the mean of its divisors is an integer number (42385729).

Almost surely, 2^84771457 is an apocalyptic number.

It is an amenable number.

84771457 is a deficient number, since it is larger than the sum of its proper divisors (1).

84771457 is an equidigital number, since it uses as much as digits as its factorization.

84771457 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 219520, while the sum is 43.

The square root of 84771457 is about 9207.1416302781. The cubic root of 84771457 is about 439.2885489419.

The spelling of 84771457 in words is "eighty-four million, seven hundred seventy-one thousand, four hundred fifty-seven".