400111171 has 2 divisors, whose sum is σ = 400111172. Its totient is φ = 400111170.

The previous prime is 400111163. The next prime is 400111183. The reversal of 400111171 is 171111004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400111171 - 2³ = 400111163 is a prime.

It is not a weakly prime, because it can be changed into another prime (400111121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200055585 + 200055586.

It is an arithmetic number, because the mean of its divisors is an integer number (200055586).

Almost surely, 2^400111171 is an apocalyptic number.

400111171 is a deficient number, since it is larger than the sum of its proper divisors (1).

400111171 is an equidigital number, since it uses as much as digits as its factorization.

400111171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28, while the sum is 16.

The square root of 400111171 is about 20002.7790819176. The cubic root of 400111171 is about 736.8745529829.

Adding to 400111171 its reverse (171111004), we get a palindrome (571222175).

The spelling of 400111171 in words is "four hundred million, one hundred eleven thousand, one hundred seventy-one".