42351311309 has 2 divisors, whose sum is σ = 42351311310. Its totient is φ = 42351311308.

The previous prime is 42351311297. The next prime is 42351311377. The reversal of 42351311309 is 90311315324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31073933284 + 11277378025 = 176278^2 + 106195^2 .

It is a cyclic number.

It is not a de Polignac number, because 42351311309 - 2²⁴ = 42334534093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42351311209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21175655654 + 21175655655.

It is an arithmetic number, because the mean of its divisors is an integer number (21175655655).

Almost surely, 2^42351311309 is an apocalyptic number.

It is an amenable number.

42351311309 is a deficient number, since it is larger than the sum of its proper divisors (1).

42351311309 is an equidigital number, since it uses as much as digits as its factorization.

42351311309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 32.

The spelling of 42351311309 in words is "forty-two billion, three hundred fifty-one million, three hundred eleven thousand, three hundred nine".