81495041393 has 4 divisors (see below), whose sum is σ = 84123913728. Its totient is φ = 78866169060.

The previous prime is 81495041363. The next prime is 81495041477. The reversal of 81495041393 is 39314059418.

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 81495041393 - 2⁸ = 81495041137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81495041323) 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, 1314436121 + ... + 1314436182.

It is an arithmetic number, because the mean of its divisors is an integer number (21030978432).

Almost surely, 2^81495041393 is an apocalyptic number.

It is an amenable number.

81495041393 is a deficient number, since it is larger than the sum of its proper divisors (2628872335).

81495041393 is a wasteful number, since it uses less digits than its factorization.

81495041393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628872334.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 81495041393 in words is "eighty-one billion, four hundred ninety-five million, forty-one thousand, three hundred ninety-three".