80540391 has 4 divisors (see below), whose sum is σ = 107387192. Its totient is φ = 53693592.

The previous prime is 80540363. The next prime is 80540399. The reversal of 80540391 is 19304508.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-80540391 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 (80540399) 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, 13423396 + ... + 13423401.

It is an arithmetic number, because the mean of its divisors is an integer number (26846798).

Almost surely, 2^80540391 is an apocalyptic number.

80540391 is a deficient number, since it is larger than the sum of its proper divisors (26846801).

80540391 is a wasteful number, since it uses less digits than its factorization.

80540391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26846800.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 80540391 is about 8974.4298426140. The cubic root of 80540391 is about 431.8549592395.

Adding to 80540391 its reverse (19304508), we get a palindrome (99844899).

The spelling of 80540391 in words is "eighty million, five hundred forty thousand, three hundred ninety-one".