84216901 has 4 divisors (see below), whose sum is σ = 84653452. Its totient is φ = 83780352.

The previous prime is 84216883. The next prime is 84216907. The reversal of 84216901 is 10961248.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 26061025 + 58155876 = 5105^2 + 7626^2 .

It is a cyclic number.

It is not a de Polignac number, because 84216901 - 2¹¹ = 84214853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84216907) 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, 217986 + ... + 218371.

It is an arithmetic number, because the mean of its divisors is an integer number (21163363).

Almost surely, 2^84216901 is an apocalyptic number.

It is an amenable number.

84216901 is a deficient number, since it is larger than the sum of its proper divisors (436551).

84216901 is a wasteful number, since it uses less digits than its factorization.

84216901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436550.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 84216901 is about 9176.9766808029. The cubic root of 84216901 is about 438.3285432096.

The spelling of 84216901 in words is "eighty-four million, two hundred sixteen thousand, nine hundred one".