81528304133039 has 2 divisors, whose sum is σ = 81528304133040. Its totient is φ = 81528304133038.

The previous prime is 81528304132861. The next prime is 81528304133057. The reversal of 81528304133039 is 93033140382518.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81528304133039 is a prime.

It is a super-2 number, since 2×81528304133039² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81528304133239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40764152066519 + 40764152066520.

It is an arithmetic number, because the mean of its divisors is an integer number (40764152066520).

Almost surely, 2^{81528304133039} is an apocalyptic number.

81528304133039 is a deficient number, since it is larger than the sum of its proper divisors (1).

81528304133039 is an equidigital number, since it uses as much as digits as its factorization.

81528304133039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 81528304133039 in words is "eighty-one trillion, five hundred twenty-eight billion, three hundred four million, one hundred thirty-three thousand, thirty-nine".