81325093523 has 2 divisors, whose sum is σ = 81325093524. Its totient is φ = 81325093522.

The previous prime is 81325093489. The next prime is 81325093541. The reversal of 81325093523 is 32539052318.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81325093523 is a prime.

It is a super-2 number, since 2×81325093523² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (81325093573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40662546761 + 40662546762.

It is an arithmetic number, because the mean of its divisors is an integer number (40662546762).

Almost surely, 2^81325093523 is an apocalyptic number.

81325093523 is a deficient number, since it is larger than the sum of its proper divisors (1).

81325093523 is an equidigital number, since it uses as much as digits as its factorization.

81325093523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 41.

The spelling of 81325093523 in words is "eighty-one billion, three hundred twenty-five million, ninety-three thousand, five hundred twenty-three".