43195681 has 2 divisors, whose sum is σ = 43195682. Its totient is φ = 43195680.

The previous prime is 43195651. The next prime is 43195697. The reversal of 43195681 is 18659134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41165056 + 2030625 = 6416^2 + 1425^2 .

It is a cyclic number.

It is not a de Polignac number, because 43195681 - 2¹⁵ = 43162913 is a prime.

It is a super-2 number, since 2×43195681² = 3731733714107522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 43195681.

It is not a weakly prime, because it can be changed into another prime (43195631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21597840 + 21597841.

It is an arithmetic number, because the mean of its divisors is an integer number (21597841).

Almost surely, 2^43195681 is an apocalyptic number.

It is an amenable number.

43195681 is a deficient number, since it is larger than the sum of its proper divisors (1).

43195681 is an equidigital number, since it uses as much as digits as its factorization.

43195681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 37.

The square root of 43195681 is about 6572.3421243876. The cubic root of 43195681 is about 350.8704348323.

It can be divided in two parts, 4319 and 5681, that added together give a 4-th power (10000 = 10⁴).

The spelling of 43195681 in words is "forty-three million, one hundred ninety-five thousand, six hundred eighty-one".