42099149 has 2 divisors, whose sum is σ = 42099150. Its totient is φ = 42099148.

The previous prime is 42099143. The next prime is 42099163. The reversal of 42099149 is 94199024.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27984100 + 14115049 = 5290^2 + 3757^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42099149 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42099143) 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, 21049574 + 21049575.

It is an arithmetic number, because the mean of its divisors is an integer number (21049575).

Almost surely, 2^42099149 is an apocalyptic number.

It is an amenable number.

42099149 is a deficient number, since it is larger than the sum of its proper divisors (1).

42099149 is an equidigital number, since it uses as much as digits as its factorization.

42099149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 42099149 is about 6488.3857006192. The cubic root of 42099149 is about 347.8759769658.

The spelling of 42099149 in words is "forty-two million, ninety-nine thousand, one hundred forty-nine".