84719581 has 2 divisors, whose sum is σ = 84719582. Its totient is φ = 84719580.

The previous prime is 84719549. The next prime is 84719587. The reversal of 84719581 is 18591748.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79388100 + 5331481 = 8910^2 + 2309^2 .

It is a cyclic number.

It is not a de Polignac number, because 84719581 - 2⁵ = 84719549 is a prime.

It is a super-2 number, since 2×84719581² = 14354814809631122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84719587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42359790 + 42359791.

It is an arithmetic number, because the mean of its divisors is an integer number (42359791).

Almost surely, 2^84719581 is an apocalyptic number.

It is an amenable number.

84719581 is a deficient number, since it is larger than the sum of its proper divisors (1).

84719581 is an equidigital number, since it uses as much as digits as its factorization.

84719581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 43.

The square root of 84719581 is about 9204.3240381899. The cubic root of 84719581 is about 439.1989229300.

The spelling of 84719581 in words is "eighty-four million, seven hundred nineteen thousand, five hundred eighty-one".