40564171 has 2 divisors, whose sum is σ = 40564172. Its totient is φ = 40564170.

The previous prime is 40564169. The next prime is 40564177. The reversal of 40564171 is 17146504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40564171 - 2¹ = 40564169 is a prime.

Together with 40564169, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40564177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20282085 + 20282086.

It is an arithmetic number, because the mean of its divisors is an integer number (20282086).

Almost surely, 2^40564171 is an apocalyptic number.

40564171 is a deficient number, since it is larger than the sum of its proper divisors (1).

40564171 is an equidigital number, since it uses as much as digits as its factorization.

40564171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 40564171 is about 6369.0007850526. Note that the first 3 decimals coincide. The cubic root of 40564171 is about 343.5955534938.

The spelling of 40564171 in words is "forty million, five hundred sixty-four thousand, one hundred seventy-one".