43660091 has 2 divisors, whose sum is σ = 43660092. Its totient is φ = 43660090.

The previous prime is 43660021. The next prime is 43660103. The reversal of 43660091 is 19006634.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43660091 - 2¹⁸ = 43397947 is a prime.

It is a super-2 number, since 2×43660091² = 3812407092256562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (43660021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21830045 + 21830046.

It is an arithmetic number, because the mean of its divisors is an integer number (21830046).

Almost surely, 2^43660091 is an apocalyptic number.

43660091 is a deficient number, since it is larger than the sum of its proper divisors (1).

43660091 is an equidigital number, since it uses as much as digits as its factorization.

43660091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 43660091 is about 6607.5783007090. The cubic root of 43660091 is about 352.1233937012.

The spelling of 43660091 in words is "forty-three million, six hundred sixty thousand, ninety-one".