43661145 has 48 divisors (see below), whose sum is σ = 80540352. Its totient is φ = 20027520.

The previous prime is 43661141. The next prime is 43661161. The reversal of 43661145 is 54116634.

It is not a de Polignac number, because 43661145 - 2² = 43661141 is a prime.

It is a super-2 number, since 2×43661145² = 3812591165422050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (43661141) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 59199 + ... + 59931.

It is an arithmetic number, because the mean of its divisors is an integer number (1677924).

Almost surely, 2^43661145 is an apocalyptic number.

It is an amenable number.

43661145 is a deficient number, since it is larger than the sum of its proper divisors (36879207).

43661145 is a wasteful number, since it uses less digits than its factorization.

43661145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790 (or 771 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 43661145 is about 6607.6580571334. The cubic root of 43661145 is about 352.1262272200.

Adding to 43661145 its reverse (54116634), we get a palindrome (97777779).

The spelling of 43661145 in words is "forty-three million, six hundred sixty-one thousand, one hundred forty-five".