81072402441 has 4 divisors (see below), whose sum is σ = 108096536592. Its totient is φ = 54048268292.

The previous prime is 81072402427. The next prime is 81072402473. The reversal of 81072402441 is 14420427018.

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 a cyclic number.

It is not a de Polignac number, because 81072402441 - 2⁹ = 81072401929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81072402491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13512067071 + ... + 13512067076.

It is an arithmetic number, because the mean of its divisors is an integer number (27024134148).

Almost surely, 2^81072402441 is an apocalyptic number.

It is an amenable number.

81072402441 is a deficient number, since it is larger than the sum of its proper divisors (27024134151).

81072402441 is a wasteful number, since it uses less digits than its factorization.

81072402441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27024134150.

The product of its (nonzero) digits is 14336, while the sum is 33.

Adding to 81072402441 its reverse (14420427018), we get a palindrome (95492829459).

The spelling of 81072402441 in words is "eighty-one billion, seventy-two million, four hundred two thousand, four hundred forty-one".