42811115685389 has 2 divisors, whose sum is σ = 42811115685390. Its totient is φ = 42811115685388.

The previous prime is 42811115685313. The next prime is 42811115685451. The reversal of 42811115685389 is 98358651111824.

It is a happy number.

It is an a-pointer prime, because the next prime (42811115685451) can be obtained adding 42811115685389 to its sum of digits (62).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42742436572900 + 68679112489 = 6537770^2 + 262067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42811115685389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42811115688389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21405557842694 + 21405557842695.

It is an arithmetic number, because the mean of its divisors is an integer number (21405557842695).

Almost surely, 2^{42811115685389} is an apocalyptic number.

It is an amenable number.

42811115685389 is a deficient number, since it is larger than the sum of its proper divisors (1).

42811115685389 is an equidigital number, since it uses as much as digits as its factorization.

42811115685389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16588800, while the sum is 62.

The spelling of 42811115685389 in words is "forty-two trillion, eight hundred eleven billion, one hundred fifteen million, six hundred eighty-five thousand, three hundred eighty-nine".