84691881 has 12 divisors (see below), whose sum is σ = 123018480. Its totient is φ = 56144760.

The previous prime is 84691847. The next prime is 84691889. The reversal of 84691881 is 18819648.

84691881 is a `hidden beast` number, since 8 + 469 + 188 + 1 = 666.

It is not a de Polignac number, because 84691881 - 2¹⁰ = 84690857 is a prime.

It is a super-2 number, since 2×84691881² = 14345429414636322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (84691889) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24675 + ... + 27896.

It is an arithmetic number, because the mean of its divisors is an integer number (10251540).

Almost surely, 2^84691881 is an apocalyptic number.

It is an amenable number.

84691881 is a deficient number, since it is larger than the sum of its proper divisors (38326599).

84691881 is a wasteful number, since it uses less digits than its factorization.

84691881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52756 (or 52753 counting only the distinct ones).

The product of its digits is 110592, while the sum is 45.

The square root of 84691881 is about 9202.8191876185. The cubic root of 84691881 is about 439.1510507373.

The spelling of 84691881 in words is "eighty-four million, six hundred ninety-one thousand, eight hundred eighty-one".