80061581 has 4 divisors (see below), whose sum is σ = 80105472. Its totient is φ = 80017692.

The previous prime is 80061577. The next prime is 80061593. The reversal of 80061581 is 18516008.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80061581 - 2² = 80061577 is a prime.

It is a super-2 number, since 2×80061581² = 12819713504439122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80061511) 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, 19085 + ... + 22898.

It is an arithmetic number, because the mean of its divisors is an integer number (20026368).

Almost surely, 2^80061581 is an apocalyptic number.

It is an amenable number.

80061581 is a deficient number, since it is larger than the sum of its proper divisors (43891).

80061581 is a wasteful number, since it uses less digits than its factorization.

80061581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43890.

The product of its (nonzero) digits is 1920, while the sum is 29.

The square root of 80061581 is about 8947.7137303336. The cubic root of 80061581 is about 430.9974698523.

Adding to 80061581 its reverse (18516008), we get a palindrome (98577589).

The spelling of 80061581 in words is "eighty million, sixty-one thousand, five hundred eighty-one".