80051891 has 4 divisors (see below), whose sum is σ = 83532432. Its totient is φ = 76571352.

The previous prime is 80051879. The next prime is 80051899. The reversal of 80051891 is 19815008.

It is a happy number.

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 80051891 - 2¹⁸ = 79789747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80051899) 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, 1740236 + ... + 1740281.

It is an arithmetic number, because the mean of its divisors is an integer number (20883108).

Almost surely, 2^80051891 is an apocalyptic number.

80051891 is a deficient number, since it is larger than the sum of its proper divisors (3480541).

80051891 is a wasteful number, since it uses less digits than its factorization.

80051891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3480540.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 80051891 is about 8947.1722348460. The cubic root of 80051891 is about 430.9800810127.

Adding to 80051891 its reverse (19815008), we get a palindrome (99866899).

The spelling of 80051891 in words is "eighty million, fifty-one thousand, eight hundred ninety-one".