84730991 has 2 divisors, whose sum is σ = 84730992. Its totient is φ = 84730990.

The previous prime is 84730981. The next prime is 84731039. The reversal of 84730991 is 19903748.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84730991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84730981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42365495 + 42365496.

It is an arithmetic number, because the mean of its divisors is an integer number (42365496).

Almost surely, 2^84730991 is an apocalyptic number.

84730991 is a deficient number, since it is larger than the sum of its proper divisors (1).

84730991 is an equidigital number, since it uses as much as digits as its factorization.

84730991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 84730991 is about 9204.9438347010. The cubic root of 84730991 is about 439.2186390913.

The spelling of 84730991 in words is "eighty-four million, seven hundred thirty thousand, nine hundred ninety-one".