81528304132859 has 2 divisors, whose sum is σ = 81528304132860. Its totient is φ = 81528304132858.

The previous prime is 81528304132841. The next prime is 81528304132861. The reversal of 81528304132859 is 95823140382518.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81528304132859 - 2⁸ = 81528304132603 is a prime.

Together with 81528304132861, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 81528304132798 and 81528304132807.

It is not a weakly prime, because it can be changed into another prime (81528304132819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40764152066429 + 40764152066430.

It is an arithmetic number, because the mean of its divisors is an integer number (40764152066430).

Almost surely, 2^{81528304132859} is an apocalyptic number.

81528304132859 is a deficient number, since it is larger than the sum of its proper divisors (1).

81528304132859 is an equidigital number, since it uses as much as digits as its factorization.

81528304132859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16588800, while the sum is 59.

The spelling of 81528304132859 in words is "eighty-one trillion, five hundred twenty-eight billion, three hundred four million, one hundred thirty-two thousand, eight hundred fifty-nine".