40100191 has 2 divisors, whose sum is σ = 40100192. Its totient is φ = 40100190.

The previous prime is 40100167. The next prime is 40100213. The reversal of 40100191 is 19100104.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40100191 - 2¹³ = 40091999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40100491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20050095 + 20050096.

It is an arithmetic number, because the mean of its divisors is an integer number (20050096).

Almost surely, 2^40100191 is an apocalyptic number.

40100191 is a deficient number, since it is larger than the sum of its proper divisors (1).

40100191 is an equidigital number, since it uses as much as digits as its factorization.

40100191 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 16.

The square root of 40100191 is about 6332.4711606134. The cubic root of 40100191 is about 342.2804915952.

Adding to 40100191 its reverse (19100104), we get a palindrome (59200295).

The spelling of 40100191 in words is "forty million, one hundred thousand, one hundred ninety-one".