43694681 has 2 divisors, whose sum is σ = 43694682. Its totient is φ = 43694680.

The previous prime is 43694671. The next prime is 43694701. The reversal of 43694681 is 18649634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28987456 + 14707225 = 5384^2 + 3835^2 .

It is a cyclic number.

It is not a de Polignac number, because 43694681 - 2⁶ = 43694617 is a prime.

It is a super-2 number, since 2×43694681² = 3818450295383522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43694611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21847340 + 21847341.

It is an arithmetic number, because the mean of its divisors is an integer number (21847341).

Almost surely, 2^43694681 is an apocalyptic number.

It is an amenable number.

43694681 is a deficient number, since it is larger than the sum of its proper divisors (1).

43694681 is an equidigital number, since it uses as much as digits as its factorization.

43694681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 41.

The square root of 43694681 is about 6610.1952316100. The cubic root of 43694681 is about 352.2163598615.

The spelling of 43694681 in words is "forty-three million, six hundred ninety-four thousand, six hundred eighty-one".