43365561 has 4 divisors (see below), whose sum is σ = 57820752. Its totient is φ = 28910372.

The previous prime is 43365533. The next prime is 43365563. The reversal of 43365561 is 16556334.

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 43365561 - 2¹⁹ = 42841273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43365563) 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, 7227591 + ... + 7227596.

It is an arithmetic number, because the mean of its divisors is an integer number (14455188).

Almost surely, 2^43365561 is an apocalyptic number.

It is an amenable number.

43365561 is a deficient number, since it is larger than the sum of its proper divisors (14455191).

43365561 is a wasteful number, since it uses less digits than its factorization.

43365561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14455190.

The product of its digits is 32400, while the sum is 33.

The square root of 43365561 is about 6585.2532980896. The cubic root of 43365561 is about 351.3298009775.

The spelling of 43365561 in words is "forty-three million, three hundred sixty-five thousand, five hundred sixty-one".