43924195561 has 3 divisors (see below), whose sum is σ = 43924405143. Its totient is φ = 43923985980.

The previous prime is 43924195537. The next prime is 43924195633. The reversal of 43924195561 is 16559142934.

The square root of 43924195561 is 209581.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3402505561 + 40521690000 = 58331^2 + 201300^2 .

It is not a de Polignac number, because 43924195561 - 2⁵ = 43924195529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43924195261) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 104791 + ... + 314371.

It is an arithmetic number, because the mean of its divisors is an integer number (14641468381).

Almost surely, 2^43924195561 is an apocalyptic number.

43924195561 is the 209581-st square number.

43924195561 is the 104791-st centered octagonal number.

It is an amenable number.

43924195561 is a deficient number, since it is larger than the sum of its proper divisors (209582).

43924195561 is an frugal number, since it uses more digits than its factorization.

43924195561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419162 (or 209581 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 49.

Multiplying 43924195561 by its sum of digits (49), we get a square (2152285582489 = 1467067²).

The spelling of 43924195561 in words is "forty-three billion, nine hundred twenty-four million, one hundred ninety-five thousand, five hundred sixty-one".