81491483523 has 16 divisors (see below), whose sum is σ = 113152905216. Its totient is φ = 52109877120.

The previous prime is 81491483503. The next prime is 81491483537. The reversal of 81491483523 is 32538419418.

It is not a de Polignac number, because 81491483523 - 2²⁴ = 81474706307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81491483503) 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 15 ways as a sum of consecutive naturals, for example, 3866715 + ... + 3887732.

It is an arithmetic number, because the mean of its divisors is an integer number (7072056576).

Almost surely, 2^81491483523 is an apocalyptic number.

81491483523 is a deficient number, since it is larger than the sum of its proper divisors (31661421693).

81491483523 is a wasteful number, since it uses less digits than its factorization.

81491483523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7754594.

The product of its digits is 829440, while the sum is 48.

The spelling of 81491483523 in words is "eighty-one billion, four hundred ninety-one million, four hundred eighty-three thousand, five hundred twenty-three".