195530581 has 4 divisors (see below), whose sum is σ = 195558912. Its totient is φ = 195502252.

The previous prime is 195530561. The next prime is 195530603. The reversal of 195530581 is 185035591.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 185035591 = 13 ⋅14233507.

It is a cyclic number.

It is not a de Polignac number, because 195530581 - 2¹⁷ = 195399509 is a prime.

It is a super-2 number, since 2×195530581² = 76464416212395122, which contains 22 as substring.

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 195530581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195530561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3690 + ... + 20116.

It is an arithmetic number, because the mean of its divisors is an integer number (48889728).

Almost surely, 2^195530581 is an apocalyptic number.

It is an amenable number.

195530581 is a deficient number, since it is larger than the sum of its proper divisors (28331).

195530581 is a wasteful number, since it uses less digits than its factorization.

195530581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28330.

The product of its (nonzero) digits is 27000, while the sum is 37.

The square root of 195530581 is about 13983.2249856748. The cubic root of 195530581 is about 580.4144689098.

The spelling of 195530581 in words is "one hundred ninety-five million, five hundred thirty thousand, five hundred eighty-one".