84471557 has 2 divisors, whose sum is σ = 84471558. Its totient is φ = 84471556.

The previous prime is 84471547. The next prime is 84471581. The reversal of 84471557 is 75517448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65383396 + 19088161 = 8086^2 + 4369^2 .

It is a cyclic number.

It is not a de Polignac number, because 84471557 - 2⁶ = 84471493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84471547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42235778 + 42235779.

It is an arithmetic number, because the mean of its divisors is an integer number (42235779).

Almost surely, 2^84471557 is an apocalyptic number.

It is an amenable number.

84471557 is a deficient number, since it is larger than the sum of its proper divisors (1).

84471557 is an equidigital number, since it uses as much as digits as its factorization.

84471557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156800, while the sum is 41.

The square root of 84471557 is about 9190.8409299694. The cubic root of 84471557 is about 438.7699062134.

The spelling of 84471557 in words is "eighty-four million, four hundred seventy-one thousand, five hundred fifty-seven".