81434058523 has 2 divisors, whose sum is σ = 81434058524. Its totient is φ = 81434058522.

The previous prime is 81434058499. The next prime is 81434058599. The reversal of 81434058523 is 32585043418.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81434058523 - 2²⁵ = 81400504091 is a prime.

It is a super-3 number, since 3×81434058523³ (a number of 34 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81434058523.

It is not a weakly prime, because it can be changed into another prime (81434055523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40717029261 + 40717029262.

It is an arithmetic number, because the mean of its divisors is an integer number (40717029262).

Almost surely, 2^81434058523 is an apocalyptic number.

81434058523 is a deficient number, since it is larger than the sum of its proper divisors (1).

81434058523 is an equidigital number, since it uses as much as digits as its factorization.

81434058523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 460800, while the sum is 43.

The spelling of 81434058523 in words is "eighty-one billion, four hundred thirty-four million, fifty-eight thousand, five hundred twenty-three".