42195691 has 2 divisors, whose sum is σ = 42195692. Its totient is φ = 42195690.

The previous prime is 42195677. The next prime is 42195697. The reversal of 42195691 is 19659124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42195691 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42195691.

It is not a weakly prime, because it can be changed into another prime (42195697) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21097845 + 21097846.

It is an arithmetic number, because the mean of its divisors is an integer number (21097846).

Almost surely, 2^42195691 is an apocalyptic number.

42195691 is a deficient number, since it is larger than the sum of its proper divisors (1).

42195691 is an equidigital number, since it uses as much as digits as its factorization.

42195691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 42195691 is about 6495.8210412541. The cubic root of 42195691 is about 348.1416909914.

The spelling of 42195691 in words is "forty-two million, one hundred ninety-five thousand, six hundred ninety-one".