40911691 has 4 divisors (see below), whose sum is σ = 41487984. Its totient is φ = 40335400.

The previous prime is 40911683. The next prime is 40911709. The reversal of 40911691 is 19611904.

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

It is a cyclic number.

It is not a de Polignac number, because 40911691 - 2³ = 40911683 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40911191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288040 + ... + 288181.

It is an arithmetic number, because the mean of its divisors is an integer number (10371996).

Almost surely, 2^40911691 is an apocalyptic number.

40911691 is a deficient number, since it is larger than the sum of its proper divisors (576293).

40911691 is an equidigital number, since it uses as much as digits as its factorization.

40911691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576292.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 40911691 is about 6396.2247458950. The cubic root of 40911691 is about 344.5739781008.

It can be divided in two parts, 409 and 11691, that added together give a square (12100 = 110²).

The spelling of 40911691 in words is "forty million, nine hundred eleven thousand, six hundred ninety-one".