40002191 has 2 divisors, whose sum is σ = 40002192. Its totient is φ = 40002190.

The previous prime is 40002133. The next prime is 40002197. The reversal of 40002191 is 19120004.

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-40002191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40002197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20001095 + 20001096.

It is an arithmetic number, because the mean of its divisors is an integer number (20001096).

Almost surely, 2^40002191 is an apocalyptic number.

40002191 is a deficient number, since it is larger than the sum of its proper divisors (1).

40002191 is an equidigital number, since it uses as much as digits as its factorization.

40002191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 40002191 is about 6324.7285317237. The cubic root of 40002191 is about 342.0014334835.

Adding to 40002191 its reverse (19120004), we get a palindrome (59122195).

The spelling of 40002191 in words is "forty million, two thousand, one hundred ninety-one".