84920891 has 4 divisors (see below), whose sum is σ = 92640984. Its totient is φ = 77200800.

The previous prime is 84920887. The next prime is 84920897. The reversal of 84920891 is 19802948.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84920891 - 2² = 84920887 is a prime.

It is a super-3 number, since 3×84920891³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84920897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3860030 + ... + 3860051.

It is an arithmetic number, because the mean of its divisors is an integer number (23160246).

Almost surely, 2^84920891 is an apocalyptic number.

84920891 is a deficient number, since it is larger than the sum of its proper divisors (7720093).

84920891 is a wasteful number, since it uses less digits than its factorization.

84920891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720092.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 84920891 is about 9215.2531706948. The cubic root of 84920891 is about 439.5465214269.

The spelling of 84920891 in words is "eighty-four million, nine hundred twenty thousand, eight hundred ninety-one".