181129873 has 2 divisors, whose sum is σ = 181129874. Its totient is φ = 181129872.

The previous prime is 181129843. The next prime is 181129891. The reversal of 181129873 is 378921181.

181129873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144793089 + 36336784 = 12033^2 + 6028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181129873 is a prime.

It is a super-2 number, since 2×181129873² = 65616061785992258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (181129843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90564936 + 90564937.

It is an arithmetic number, because the mean of its divisors is an integer number (90564937).

Almost surely, 2^181129873 is an apocalyptic number.

It is an amenable number.

181129873 is a deficient number, since it is larger than the sum of its proper divisors (1).

181129873 is an equidigital number, since it uses as much as digits as its factorization.

181129873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 40.

The square root of 181129873 is about 13458.4498735924. The cubic root of 181129873 is about 565.8005442457.

It can be divided in two parts, 1811 and 29873, that added together give a square (31684 = 178²).

The spelling of 181129873 in words is "one hundred eighty-one million, one hundred twenty-nine thousand, eight hundred seventy-three".