40016591 has 2 divisors, whose sum is σ = 40016592. Its totient is φ = 40016590.

The previous prime is 40016569. The next prime is 40016593. The reversal of 40016591 is 19561004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40016591 is a prime.

It is a super-2 number, since 2×40016591² = 3202655110522562, which contains 22 as substring.

Together with 40016593, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40016591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40016593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20008295 + 20008296.

It is an arithmetic number, because the mean of its divisors is an integer number (20008296).

Almost surely, 2^40016591 is an apocalyptic number.

40016591 is a deficient number, since it is larger than the sum of its proper divisors (1).

40016591 is an equidigital number, since it uses as much as digits as its factorization.

40016591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 40016591 is about 6325.8668180732. The cubic root of 40016591 is about 342.0424664844.

Adding to 40016591 its reverse (19561004), we get a palindrome (59577595).

The spelling of 40016591 in words is "forty million, sixteen thousand, five hundred ninety-one".