84144991 has 4 divisors (see below), whose sum is σ = 96165712. Its totient is φ = 72124272.

The previous prime is 84144959. The next prime is 84145013. The reversal of 84144991 is 19944148.

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 84144991 - 2⁵ = 84144959 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 (84144911) 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, 6010350 + ... + 6010363.

It is an arithmetic number, because the mean of its divisors is an integer number (24041428).

Almost surely, 2^84144991 is an apocalyptic number.

84144991 is a deficient number, since it is larger than the sum of its proper divisors (12020721).

84144991 is a wasteful number, since it uses less digits than its factorization.

84144991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12020720.

The product of its digits is 41472, while the sum is 40.

The square root of 84144991 is about 9173.0578870952. The cubic root of 84144991 is about 438.2037496477.

The spelling of 84144991 in words is "eighty-four million, one hundred forty-four thousand, nine hundred ninety-one".