43663961 has 4 divisors (see below), whose sum is σ = 47633424. Its totient is φ = 39694500.

The previous prime is 43663943. The next prime is 43663979. The reversal of 43663961 is 16936634.

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 an interprime number because it is at equal distance from previous prime (43663943) and next prime (43663979).

It is a cyclic number.

It is not a de Polignac number, because 43663961 - 2¹⁴ = 43647577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (43663901) 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 in 3 ways as a sum of consecutive naturals, for example, 1984715 + ... + 1984736.

It is an arithmetic number, because the mean of its divisors is an integer number (11908356).

Almost surely, 2^43663961 is an apocalyptic number.

It is an amenable number.

43663961 is a deficient number, since it is larger than the sum of its proper divisors (3969463).

43663961 is a wasteful number, since it uses less digits than its factorization.

43663961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969462.

The product of its digits is 69984, while the sum is 38.

The square root of 43663961 is about 6607.8711397847. The cubic root of 43663961 is about 352.1337973844.

The spelling of 43663961 in words is "forty-three million, six hundred sixty-three thousand, nine hundred sixty-one".