181136526431 has 16 divisors (see below), whose sum is σ = 209083762944. Its totient is φ = 153708825984.

The previous prime is 181136526383. The next prime is 181136526443. The reversal of 181136526431 is 134625631181.

It is a happy number.

It is not a de Polignac number, because 181136526431 - 2³⁴ = 163956657247 is a prime.

It is a super-2 number, since 2×181136526431² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181136526031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1085336 + ... + 1241058.

It is an arithmetic number, because the mean of its divisors is an integer number (13067735184).

Almost surely, 2^181136526431 is an apocalyptic number.

181136526431 is a deficient number, since it is larger than the sum of its proper divisors (27947236513).

181136526431 is a wasteful number, since it uses less digits than its factorization.

181136526431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157390.

The product of its digits is 103680, while the sum is 41.

The spelling of 181136526431 in words is "one hundred eighty-one billion, one hundred thirty-six million, five hundred twenty-six thousand, four hundred thirty-one".