40171919 has 2 divisors, whose sum is σ = 40171920. Its totient is φ = 40171918.

The previous prime is 40171897. The next prime is 40171921. The reversal of 40171919 is 91917104.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40171919 is a prime.

It is a super-2 number, since 2×40171919² = 3227566152285122, which contains 22 as substring.

Together with 40171921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40171949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20085959 + 20085960.

It is an arithmetic number, because the mean of its divisors is an integer number (20085960).

Almost surely, 2^40171919 is an apocalyptic number.

40171919 is a deficient number, since it is larger than the sum of its proper divisors (1).

40171919 is an equidigital number, since it uses as much as digits as its factorization.

40171919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 32.

The square root of 40171919 is about 6338.1321380987. The cubic root of 40171919 is about 342.4844513161.

The spelling of 40171919 in words is "forty million, one hundred seventy-one thousand, nine hundred nineteen".