181328633929 has 9 divisors (see below), whose sum is σ = 182120271463. Its totient is φ = 180540428152.

The previous prime is 181328633911. The next prime is 181328633957. The reversal of 181328633929 is 929336823181.

The square root of 181328633929 is 425827.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 11930537529 + 169398096400 = 109227^2 + 411580^2 .

It is not a de Polignac number, because 181328633929 - 2¹⁵ = 181328601161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181328633929.

It is not an unprimeable number, because it can be changed into a prime (181328633999) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 114546672 + ... + 114548254.

Almost surely, 2^181328633929 is an apocalyptic number.

181328633929 is the 425827-th square number.

181328633929 is the 212914-th centered octagonal number.

It is an amenable number.

181328633929 is a deficient number, since it is larger than the sum of its proper divisors (791637534).

181328633929 is an frugal number, since it uses more digits than its factorization.

181328633929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3704 (or 1852 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 55.

The spelling of 181328633929 in words is "one hundred eighty-one billion, three hundred twenty-eight million, six hundred thirty-three thousand, nine hundred twenty-nine".