84771139 has 2 divisors, whose sum is σ = 84771140. Its totient is φ = 84771138.

The previous prime is 84771121. The next prime is 84771161. The reversal of 84771139 is 93117748.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84771139 - 2²³ = 76382531 is a prime.

It is a super-3 number, since 3×84771139³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (84771119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42385569 + 42385570.

It is an arithmetic number, because the mean of its divisors is an integer number (42385570).

Almost surely, 2^84771139 is an apocalyptic number.

84771139 is a deficient number, since it is larger than the sum of its proper divisors (1).

84771139 is an equidigital number, since it uses as much as digits as its factorization.

84771139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 40.

The square root of 84771139 is about 9207.1243610587. The cubic root of 84771139 is about 439.2879996457.

The spelling of 84771139 in words is "eighty-four million, seven hundred seventy-one thousand, one hundred thirty-nine".