81344010431 has 4 divisors (see below), whose sum is σ = 81353044632. Its totient is φ = 81334976232.

The previous prime is 81344010427. The next prime is 81344010463. The reversal of 81344010431 is 13401044318.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81344010431 - 2² = 81344010427 is a prime.

It is a super-2 number, since 2×81344010431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81344010394 and 81344010403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81344010421) 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, 4503581 + ... + 4521606.

It is an arithmetic number, because the mean of its divisors is an integer number (20338261158).

Almost surely, 2^81344010431 is an apocalyptic number.

81344010431 is a deficient number, since it is larger than the sum of its proper divisors (9034201).

81344010431 is an equidigital number, since it uses as much as digits as its factorization.

81344010431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9034200.

The product of its (nonzero) digits is 4608, while the sum is 29.

Adding to 81344010431 its reverse (13401044318), we get a palindrome (94745054749).

The spelling of 81344010431 in words is "eighty-one billion, three hundred forty-four million, ten thousand, four hundred thirty-one".