42195709 has 2 divisors, whose sum is σ = 42195710. Its totient is φ = 42195708.

The previous prime is 42195697. The next prime is 42195719. The reversal of 42195709 is 90759124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39879225 + 2316484 = 6315^2 + 1522^2 .

It is a cyclic number.

It is not a de Polignac number, because 42195709 - 2⁵ = 42195677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42195719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21097854 + 21097855.

It is an arithmetic number, because the mean of its divisors is an integer number (21097855).

Almost surely, 2^42195709 is an apocalyptic number.

It is an amenable number.

42195709 is a deficient number, since it is larger than the sum of its proper divisors (1).

42195709 is an equidigital number, since it uses as much as digits as its factorization.

42195709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 42195709 is about 6495.8224267601. The cubic root of 42195709 is about 348.1417404952.

The spelling of 42195709 in words is "forty-two million, one hundred ninety-five thousand, seven hundred nine".