40031191 has 2 divisors, whose sum is σ = 40031192. Its totient is φ = 40031190.

The previous prime is 40031183. The next prime is 40031203. The reversal of 40031191 is 19113004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40031191 - 2³ = 40031183 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 (40031171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20015595 + 20015596.

It is an arithmetic number, because the mean of its divisors is an integer number (20015596).

Almost surely, 2^40031191 is an apocalyptic number.

40031191 is a deficient number, since it is larger than the sum of its proper divisors (1).

40031191 is an equidigital number, since it uses as much as digits as its factorization.

40031191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 40031191 is about 6327.0207048816. The cubic root of 40031191 is about 342.0840593394.

Adding to 40031191 its reverse (19113004), we get a palindrome (59144195).

The spelling of 40031191 in words is "forty million, thirty-one thousand, one hundred ninety-one".