84171457 has 2 divisors, whose sum is σ = 84171458. Its totient is φ = 84171456.

The previous prime is 84171449. The next prime is 84171491. The reversal of 84171457 is 75417148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71893441 + 12278016 = 8479^2 + 3504^2 .

It is a cyclic number.

It is not a de Polignac number, because 84171457 - 2³ = 84171449 is a prime.

It is a super-4 number, since 4×84171457⁴ (a number of 33 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (84171557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42085728 + 42085729.

It is an arithmetic number, because the mean of its divisors is an integer number (42085729).

Almost surely, 2^84171457 is an apocalyptic number.

It is an amenable number.

84171457 is a deficient number, since it is larger than the sum of its proper divisors (1).

84171457 is an equidigital number, since it uses as much as digits as its factorization.

84171457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 37.

The square root of 84171457 is about 9174.5003678675. The cubic root of 84171457 is about 438.2496873583.

The spelling of 84171457 in words is "eighty-four million, one hundred seventy-one thousand, four hundred fifty-seven".