81571113023 has 2 divisors, whose sum is σ = 81571113024. Its totient is φ = 81571113022.

The previous prime is 81571112947. The next prime is 81571113061. The reversal of 81571113023 is 32031117518.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81571113023 - 2¹⁴ = 81571096639 is a prime.

It is a super-2 number, since 2×81571113023² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81571112023) 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 as a sum of consecutive naturals, namely, 40785556511 + 40785556512.

It is an arithmetic number, because the mean of its divisors is an integer number (40785556512).

Almost surely, 2^81571113023 is an apocalyptic number.

81571113023 is a deficient number, since it is larger than the sum of its proper divisors (1).

81571113023 is an equidigital number, since it uses as much as digits as its factorization.

81571113023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 81571113023 in words is "eighty-one billion, five hundred seventy-one million, one hundred thirteen thousand, twenty-three".