81313127041 has 4 divisors (see below), whose sum is σ = 83296374084. Its totient is φ = 79329880000.

The previous prime is 81313127039. The next prime is 81313127059. The reversal of 81313127041 is 14072131318.

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 31760586225 + 49552540816 = 178215^2 + 222604^2 .

It is a cyclic number.

It is not a de Polignac number, because 81313127041 - 2¹ = 81313127039 is a prime.

It is a super-2 number, since 2×81313127041² (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 = 81313126994 and 81313127012.

It is not an unprimeable number, because it can be changed into a prime (81313127741) 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, 991623460 + ... + 991623541.

It is an arithmetic number, because the mean of its divisors is an integer number (20824093521).

Almost surely, 2^81313127041 is an apocalyptic number.

It is an amenable number.

81313127041 is a deficient number, since it is larger than the sum of its proper divisors (1983247043).

81313127041 is a wasteful number, since it uses less digits than its factorization.

81313127041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983247042.

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 81313127041 its reverse (14072131318), we get a palindrome (95385258359).

The spelling of 81313127041 in words is "eighty-one billion, three hundred thirteen million, one hundred twenty-seven thousand, forty-one".