84906991 has 16 divisors (see below), whose sum is σ = 96611200. Its totient is φ = 73973088.

The previous prime is 84906973. The next prime is 84907021. The reversal of 84906991 is 19960948.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84906991 is a prime.

It is a super-3 number, since 3×84906991³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84906911) 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 15 ways as a sum of consecutive naturals, for example, 93160 + ... + 94066.

It is an arithmetic number, because the mean of its divisors is an integer number (6038200).

Almost surely, 2^84906991 is an apocalyptic number.

84906991 is a deficient number, since it is larger than the sum of its proper divisors (11704209).

84906991 is a wasteful number, since it uses less digits than its factorization.

84906991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 84906991 is about 9214.4989554506. The cubic root of 84906991 is about 439.5225382038.

The spelling of 84906991 in words is "eighty-four million, nine hundred six thousand, nine hundred ninety-one".