42117149 has 2 divisors, whose sum is σ = 42117150. Its totient is φ = 42117148.

The previous prime is 42117113. The next prime is 42117151. The reversal of 42117149 is 94171124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37429924 + 4687225 = 6118^2 + 2165^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42117149 is a prime.

Together with 42117151, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42117169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21058574 + 21058575.

It is an arithmetic number, because the mean of its divisors is an integer number (21058575).

Almost surely, 2^42117149 is an apocalyptic number.

It is an amenable number.

42117149 is a deficient number, since it is larger than the sum of its proper divisors (1).

42117149 is an equidigital number, since it uses as much as digits as its factorization.

42117149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 29.

The square root of 42117149 is about 6489.7726462489. The cubic root of 42117149 is about 347.9255494276.

The spelling of 42117149 in words is "forty-two million, one hundred seventeen thousand, one hundred forty-nine".