81325093489 has 2 divisors, whose sum is σ = 81325093490. Its totient is φ = 81325093488.

The previous prime is 81325093471. The next prime is 81325093523. The reversal of 81325093489 is 98439052318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80803747600 + 521345889 = 284260^2 + 22833^2 .

It is a cyclic number.

It is not a de Polignac number, because 81325093489 - 2⁹ = 81325092977 is a prime.

It is a super-2 number, since 2×81325093489² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81325090489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40662546744 + 40662546745.

It is an arithmetic number, because the mean of its divisors is an integer number (40662546745).

Almost surely, 2^81325093489 is an apocalyptic number.

It is an amenable number.

81325093489 is a deficient number, since it is larger than the sum of its proper divisors (1).

81325093489 is an equidigital number, since it uses as much as digits as its factorization.

81325093489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The spelling of 81325093489 in words is "eighty-one billion, three hundred twenty-five million, ninety-three thousand, four hundred eighty-nine".