181551010093 has 4 divisors (see below), whose sum is σ = 182206429180. Its totient is φ = 180895591008.

The previous prime is 181551010057. The next prime is 181551010127. The reversal of 181551010093 is 390010155181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 390010155181 = 881 ⋅442690301.

It can be written as a sum of positive squares in 2 ways, for example, as 10768835529 + 170782174564 = 103773^2 + 413258^2 .

It is a cyclic number.

It is not a de Polignac number, because 181551010093 - 2⁹ = 181551009581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181551011093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327709128 + ... + 327709681.

It is an arithmetic number, because the mean of its divisors is an integer number (45551607295).

Almost surely, 2^181551010093 is an apocalyptic number.

It is an amenable number.

181551010093 is a deficient number, since it is larger than the sum of its proper divisors (655419087).

181551010093 is an equidigital number, since it uses as much as digits as its factorization.

181551010093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655419086.

The product of its (nonzero) digits is 5400, while the sum is 34.

The spelling of 181551010093 in words is "one hundred eighty-one billion, five hundred fifty-one million, ten thousand, ninety-three".