80395561 has 4 divisors (see below), whose sum is σ = 82568452. Its totient is φ = 78222672.

The previous prime is 80395559. The next prime is 80395589. The reversal of 80395561 is 16559308.

It is the 3661-st star number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 72777961 + 7617600 = 8531^2 + 2760^2 .

It is a cyclic number.

It is not a de Polignac number, because 80395561 - 2¹ = 80395559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 2172853 = 80395561 / (8 + 0 + 3 + 9 + 5 + 5 + 6 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80395561.

It is not an unprimeable number, because it can be changed into a prime (80395531) 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, 1086390 + ... + 1086463.

It is an arithmetic number, because the mean of its divisors is an integer number (20642113).

Almost surely, 2^80395561 is an apocalyptic number.

It is an amenable number.

80395561 is a deficient number, since it is larger than the sum of its proper divisors (2172891).

80395561 is a wasteful number, since it uses less digits than its factorization.

80395561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2172890.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 80395561 is about 8966.3571755758. The cubic root of 80395561 is about 431.5959460046.

It can be divided in two parts, 80 and 395561, that added together give a square (395641 = 629²).

The spelling of 80395561 in words is "eighty million, three hundred ninety-five thousand, five hundred sixty-one".