401010191 has 2 divisors, whose sum is σ = 401010192. Its totient is φ = 401010190.

The previous prime is 401010179. The next prime is 401010223. The reversal of 401010191 is 191010104.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401010191 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (401010091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200505095 + 200505096.

It is an arithmetic number, because the mean of its divisors is an integer number (200505096).

Almost surely, 2^401010191 is an apocalyptic number.

401010191 is a deficient number, since it is larger than the sum of its proper divisors (1).

401010191 is an equidigital number, since it uses as much as digits as its factorization.

401010191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 401010191 is about 20025.2388500113. The cubic root of 401010191 is about 737.4260408837.

Adding to 401010191 its reverse (191010104), we get a palindrome (592020295).

The spelling of 401010191 in words is "four hundred one million, ten thousand, one hundred ninety-one".