43750561 has 4 divisors (see below), whose sum is σ = 44681472. Its totient is φ = 42819652.

The previous prime is 43750543. The next prime is 43750573. The reversal of 43750561 is 16505734.

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 a de Polignac number, because none of the positive numbers 2^k-43750561 is a prime.

It is a super-2 number, since 2×43750561² = 3828223175629442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43750541) 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, 465385 + ... + 465478.

It is an arithmetic number, because the mean of its divisors is an integer number (11170368).

Almost surely, 2^43750561 is an apocalyptic number.

It is an amenable number.

43750561 is a deficient number, since it is larger than the sum of its proper divisors (930911).

43750561 is an equidigital number, since it uses as much as digits as its factorization.

43750561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930910.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 43750561 is about 6614.4206851394. The cubic root of 43750561 is about 352.3664427052.

The spelling of 43750561 in words is "forty-three million, seven hundred fifty thousand, five hundred sixty-one".