42101309 has 2 divisors, whose sum is σ = 42101310. Its totient is φ = 42101308.

The previous prime is 42101287. The next prime is 42101327. The reversal of 42101309 is 90310124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26522500 + 15578809 = 5150^2 + 3947^2 .

It is a cyclic number.

It is not a de Polignac number, because 42101309 - 2¹² = 42097213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42101329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21050654 + 21050655.

It is an arithmetic number, because the mean of its divisors is an integer number (21050655).

Almost surely, 2^42101309 is an apocalyptic number.

It is an amenable number.

42101309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42101309 is an equidigital number, since it uses as much as digits as its factorization.

42101309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 42101309 is about 6488.5521497480. The cubic root of 42101309 is about 347.8819264072.

The spelling of 42101309 in words is "forty-two million, one hundred one thousand, three hundred nine".