41640681 has 4 divisors (see below), whose sum is σ = 55520912. Its totient is φ = 27760452.

The previous prime is 41640631. The next prime is 41640691. The reversal of 41640681 is 18604614.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 41640681 - 2⁶ = 41640617 is a prime.

It is a super-2 number, since 2×41640681² = 3467892628287522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (41640611) 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, 6940111 + ... + 6940116.

It is an arithmetic number, because the mean of its divisors is an integer number (13880228).

Almost surely, 2^41640681 is an apocalyptic number.

It is an amenable number.

41640681 is a deficient number, since it is larger than the sum of its proper divisors (13880231).

41640681 is a wasteful number, since it uses less digits than its factorization.

41640681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13880230.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 41640681 is about 6452.9590886662. The cubic root of 41640681 is about 346.6085523680.

The spelling of 41640681 in words is "forty-one million, six hundred forty thousand, six hundred eighty-one".