42315856109 has 2 divisors, whose sum is σ = 42315856110. Its totient is φ = 42315856108.

The previous prime is 42315856103. The next prime is 42315856123. The reversal of 42315856109 is 90165851324.

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., 21326221225 + 20989634884 = 146035^2 + 144878^2 .

It is a cyclic number.

It is not a de Polignac number, because 42315856109 - 2²⁰ = 42314807533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42315856109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42315856103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21157928054 + 21157928055.

It is an arithmetic number, because the mean of its divisors is an integer number (21157928055).

Almost surely, 2^42315856109 is an apocalyptic number.

It is an amenable number.

42315856109 is a deficient number, since it is larger than the sum of its proper divisors (1).

42315856109 is an equidigital number, since it uses as much as digits as its factorization.

42315856109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 42315856109 in words is "forty-two billion, three hundred fifteen million, eight hundred fifty-six thousand, one hundred nine".