181138131 has 6 divisors (see below), whose sum is σ = 261643980. Its totient is φ = 120758748.

The previous prime is 181138129. The next prime is 181138159. The reversal of 181138131 is 131831181.

It is not a de Polignac number, because 181138131 - 2¹ = 181138129 is a prime.

It is a super-2 number, since 2×181138131² = 65622045004346322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 181138095 and 181138104.

It is not an unprimeable number, because it can be changed into a prime (181138171) 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 5 ways as a sum of consecutive naturals, for example, 10063221 + ... + 10063238.

It is an arithmetic number, because the mean of its divisors is an integer number (43607330).

Almost surely, 2^181138131 is an apocalyptic number.

181138131 is a deficient number, since it is larger than the sum of its proper divisors (80505849).

181138131 is a wasteful number, since it uses less digits than its factorization.

181138131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20126465 (or 20126462 counting only the distinct ones).

The product of its digits is 576, while the sum is 27.

The square root of 181138131 is about 13458.7566662006. The cubic root of 181138131 is about 565.8091426983.

It can be divided in two parts, 18113 and 8131, that added together give a square (26244 = 162²).

The spelling of 181138131 in words is "one hundred eighty-one million, one hundred thirty-eight thousand, one hundred thirty-one".