43697081 has 4 divisors (see below), whose sum is σ = 43990500. Its totient is φ = 43403664.

The previous prime is 43697063. The next prime is 43697083. The reversal of 43697081 is 18079634.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23814400 + 19882681 = 4880^2 + 4459^2 .

It is a cyclic number.

It is not a de Polignac number, because 43697081 - 2¹⁰ = 43696057 is a prime.

It is a super-2 number, since 2×43697081² = 3818869775841122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43697083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146486 + ... + 146783.

It is an arithmetic number, because the mean of its divisors is an integer number (10997625).

Almost surely, 2^43697081 is an apocalyptic number.

It is an amenable number.

43697081 is a deficient number, since it is larger than the sum of its proper divisors (293419).

43697081 is a wasteful number, since it uses less digits than its factorization.

43697081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293418.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 43697081 is about 6610.3767668719. The cubic root of 43697081 is about 352.2228084251. Note that the first 3 decimals are identical.

The spelling of 43697081 in words is "forty-three million, six hundred ninety-seven thousand, eighty-one".