81230736441 has 4 divisors (see below), whose sum is σ = 108307648592. Its totient is φ = 54153824292.

The previous prime is 81230736407. The next prime is 81230736443. The reversal of 81230736441 is 14463703218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 81230736441 - 2²⁵ = 81197182009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81230736441.

It is not an unprimeable number, because it can be changed into a prime (81230736443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13538456071 + ... + 13538456076.

It is an arithmetic number, because the mean of its divisors is an integer number (27076912148).

Almost surely, 2^81230736441 is an apocalyptic number.

It is an amenable number.

81230736441 is a deficient number, since it is larger than the sum of its proper divisors (27076912151).

81230736441 is a wasteful number, since it uses less digits than its factorization.

81230736441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27076912150.

The product of its (nonzero) digits is 96768, while the sum is 39.

The spelling of 81230736441 in words is "eighty-one billion, two hundred thirty million, seven hundred thirty-six thousand, four hundred forty-one".