80999421 has 8 divisors (see below), whose sum is σ = 108463680. Its totient is φ = 53767392.

The previous prime is 80999419. The next prime is 80999431. The reversal of 80999421 is 12499908.

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

It is not a de Polignac number, because 80999421 - 2¹ = 80999419 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80999431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57241 + ... + 58638.

It is an arithmetic number, because the mean of its divisors is an integer number (13557960).

Almost surely, 2^80999421 is an apocalyptic number.

It is an amenable number.

80999421 is a deficient number, since it is larger than the sum of its proper divisors (27464259).

80999421 is a wasteful number, since it uses less digits than its factorization.

80999421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116115.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 80999421 is about 8999.9678332759. The cubic root of 80999421 is about 432.6738401484.

The spelling of 80999421 in words is "eighty million, nine hundred ninety-nine thousand, four hundred twenty-one".