84540891 has 8 divisors (see below), whose sum is σ = 112763664. Its totient is φ = 56339360.

The previous prime is 84540851. The next prime is 84540917. The reversal of 84540891 is 19804548.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84540891 - 2⁷ = 84540763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84540851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13021 + ... + 18401.

It is an arithmetic number, because the mean of its divisors is an integer number (14095458).

Almost surely, 2^84540891 is an apocalyptic number.

84540891 is a deficient number, since it is larger than the sum of its proper divisors (28222773).

84540891 is a wasteful number, since it uses less digits than its factorization.

84540891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10621.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 84540891 is about 9194.6120635946. The cubic root of 84540891 is about 438.8899203902.

The spelling of 84540891 in words is "eighty-four million, five hundred forty thousand, eight hundred ninety-one".