80542019 has 4 divisors (see below), whose sum is σ = 83319360. Its totient is φ = 77764680.

The previous prime is 80541997. The next prime is 80542027. The reversal of 80542019 is 91024508.

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 80542019 - 2⁸ = 80541763 is a prime.

It is a super-2 number, since 2×80542019² = 12974033649192722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 2777311 = 80542019 / (8 + 0 + 5 + 4 + 2 + 0 + 1 + 9).

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 80541982 and 80542000.

It is not an unprimeable number, because it can be changed into a prime (80544019) 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, 1388627 + ... + 1388684.

It is an arithmetic number, because the mean of its divisors is an integer number (20829840).

Almost surely, 2^80542019 is an apocalyptic number.

80542019 is a deficient number, since it is larger than the sum of its proper divisors (2777341).

80542019 is a wasteful number, since it uses less digits than its factorization.

80542019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2777340.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 80542019 is about 8974.5205442965. The cubic root of 80542019 is about 431.8578689809.

It can be divided in two parts, 805 and 42019, that added together give a palindrome (42824).

The spelling of 80542019 in words is "eighty million, five hundred forty-two thousand, nineteen".