42061309 has 2 divisors, whose sum is σ = 42061310. Its totient is φ = 42061308.

The previous prime is 42061303. The next prime is 42061321. The reversal of 42061309 is 90316024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42055225 + 6084 = 6485^2 + 78^2 .

It is a cyclic number.

It is not a de Polignac number, because 42061309 - 2⁹ = 42060797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42061303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21030654 + 21030655.

It is an arithmetic number, because the mean of its divisors is an integer number (21030655).

Almost surely, 2^42061309 is an apocalyptic number.

It is an amenable number.

42061309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42061309 is an equidigital number, since it uses as much as digits as its factorization.

42061309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 42061309 is about 6485.4690655341. The cubic root of 42061309 is about 347.7717185409.

The spelling of 42061309 in words is "forty-two million, sixty-one thousand, three hundred nine".