81514324201 has 4 divisors (see below), whose sum is σ = 83052330372. Its totient is φ = 79976318032.

The previous prime is 81514324139. The next prime is 81514324207. The reversal of 81514324201 is 10242341518.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27316156176 + 54198168025 = 165276^2 + 232805^2 .

It is a cyclic number.

It is not a de Polignac number, because 81514324201 - 2¹⁵ = 81514291433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81514324207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769003006 + ... + 769003111.

It is an arithmetic number, because the mean of its divisors is an integer number (20763082593).

Almost surely, 2^81514324201 is an apocalyptic number.

It is an amenable number.

81514324201 is a deficient number, since it is larger than the sum of its proper divisors (1538006171).

81514324201 is a wasteful number, since it uses less digits than its factorization.

81514324201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538006170.

The product of its (nonzero) digits is 7680, while the sum is 31.

Adding to 81514324201 its reverse (10242341518), we get a palindrome (91756665719).

The spelling of 81514324201 in words is "eighty-one billion, five hundred fourteen million, three hundred twenty-four thousand, two hundred one".