81301574123 has 16 divisors (see below), whose sum is σ = 106697898240. Its totient is φ = 60017565600.

The previous prime is 81301574099. The next prime is 81301574131. The reversal of 81301574123 is 32147510318.

It is a cyclic number.

It is not a de Polignac number, because 81301574123 - 2¹⁰ = 81301573099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81301574623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27784448 + ... + 27787373.

It is an arithmetic number, because the mean of its divisors is an integer number (6668618640).

Almost surely, 2^81301574123 is an apocalyptic number.

81301574123 is a deficient number, since it is larger than the sum of its proper divisors (25396324117).

81301574123 is a wasteful number, since it uses less digits than its factorization.

81301574123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55571858.

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 81301574123 in words is "eighty-one billion, three hundred one million, five hundred seventy-four thousand, one hundred twenty-three".