42197539 has 2 divisors, whose sum is σ = 42197540. Its totient is φ = 42197538.

The previous prime is 42197521. The next prime is 42197549. The reversal of 42197539 is 93579124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42197539 - 2⁷ = 42197411 is a prime.

It is not a weakly prime, because it can be changed into another prime (42197549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21098769 + 21098770.

It is an arithmetic number, because the mean of its divisors is an integer number (21098770).

Almost surely, 2^42197539 is an apocalyptic number.

42197539 is a deficient number, since it is larger than the sum of its proper divisors (1).

42197539 is an equidigital number, since it uses as much as digits as its factorization.

42197539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 42197539 is about 6495.9632849948. The cubic root of 42197539 is about 348.1467733149.

The spelling of 42197539 in words is "forty-two million, one hundred ninety-seven thousand, five hundred thirty-nine".