43320991 has 8 divisors (see below), whose sum is σ = 49724064. Its totient is φ = 36971520.

The previous prime is 43320989. The next prime is 43320997. The reversal of 43320991 is 19902334.

43320991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43320991 - 2¹ = 43320989 is a prime.

It is a super-2 number, since 2×43320991² = 3753416522444162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43320997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11650 + ... + 14911.

It is an arithmetic number, because the mean of its divisors is an integer number (6215508).

Almost surely, 2^43320991 is an apocalyptic number.

43320991 is a deficient number, since it is larger than the sum of its proper divisors (6403073).

43320991 is a wasteful number, since it uses less digits than its factorization.

43320991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26801.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 43320991 is about 6581.8683517676. The cubic root of 43320991 is about 351.2093971633.

The spelling of 43320991 in words is "forty-three million, three hundred twenty thousand, nine hundred ninety-one".