84550991 has 8 divisors (see below), whose sum is σ = 96685344. Its totient is φ = 72430560.

The previous prime is 84550987. The next prime is 84551069. The reversal of 84550991 is 19905548.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84550991 - 2² = 84550987 is a prime.

It is a super-3 number, since 3×84550991³ (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 (84550901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21821 + ... + 25401.

It is an arithmetic number, because the mean of its divisors is an integer number (12085668).

Almost surely, 2^84550991 is an apocalyptic number.

84550991 is a deficient number, since it is larger than the sum of its proper divisors (12134353).

84550991 is a wasteful number, since it uses less digits than its factorization.

84550991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6961.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 84550991 is about 9195.1612818917. The cubic root of 84550991 is about 438.9073975803.

The spelling of 84550991 in words is "eighty-four million, five hundred fifty thousand, nine hundred ninety-one".