43081691 has 8 divisors (see below), whose sum is σ = 45045504. Its totient is φ = 41125480.

The previous prime is 43081679. The next prime is 43081729. The reversal of 43081691 is 19618034.

It is a happy number.

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 43081691 - 2¹⁸ = 42819547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43081601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11906 + ... + 15096.

It is an arithmetic number, because the mean of its divisors is an integer number (5630688).

Almost surely, 2^43081691 is an apocalyptic number.

43081691 is a deficient number, since it is larger than the sum of its proper divisors (1963813).

43081691 is a wasteful number, since it uses less digits than its factorization.

43081691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 43081691 is about 6563.6644490711. The cubic root of 43081691 is about 350.5615231274.

The spelling of 43081691 in words is "forty-three million, eighty-one thousand, six hundred ninety-one".