80029991 has 4 divisors (see below), whose sum is σ = 81981984. Its totient is φ = 78078000.

The previous prime is 80029981. The next prime is 80030021. The reversal of 80029991 is 19992008.

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 80029991 - 2¹⁰ = 80028967 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 (80029951) 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, 975935 + ... + 976016.

It is an arithmetic number, because the mean of its divisors is an integer number (20495496).

Almost surely, 2^80029991 is an apocalyptic number.

80029991 is a deficient number, since it is larger than the sum of its proper divisors (1951993).

80029991 is a wasteful number, since it uses less digits than its factorization.

80029991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1951992.

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 80029991 is about 8945.9483007672. The cubic root of 80029991 is about 430.9407759882.

The spelling of 80029991 in words is "eighty million, twenty-nine thousand, nine hundred ninety-one".