80821499 has 8 divisors (see below), whose sum is σ = 89232192. Its totient is φ = 72588040.

The previous prime is 80821493. The next prime is 80821511. The reversal of 80821499 is 99412808.

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 80821499 - 2⁴ = 80821483 is a prime.

It is a super-2 number, since 2×80821499² = 13064229401214002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80821493) 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, 43349 + ... + 45174.

It is an arithmetic number, because the mean of its divisors is an integer number (11154024).

Almost surely, 2^80821499 is an apocalyptic number.

80821499 is a deficient number, since it is larger than the sum of its proper divisors (8410693).

80821499 is a wasteful number, since it uses less digits than its factorization.

80821499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88617.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 80821499 is about 8990.0778083396. The cubic root of 80821499 is about 432.3568064838.

The spelling of 80821499 in words is "eighty million, eight hundred twenty-one thousand, four hundred ninety-nine".