181338867 has 6 divisors (see below), whose sum is σ = 261933932. Its totient is φ = 120892572.

The previous prime is 181338863. The next prime is 181338889. The reversal of 181338867 is 768833181.

It is not a de Polignac number, because 181338867 - 2² = 181338863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181338863) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10074373 + ... + 10074390.

Almost surely, 2^181338867 is an apocalyptic number.

181338867 is a deficient number, since it is larger than the sum of its proper divisors (80595065).

181338867 is a wasteful number, since it uses less digits than its factorization.

181338867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20148769 (or 20148766 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 181338867 is about 13466.2120509073. The cubic root of 181338867 is about 566.0180741064.

It can be divided in two parts, 18133 and 8867, that added together give a cube (27000 = 30³).

The spelling of 181338867 in words is "one hundred eighty-one million, three hundred thirty-eight thousand, eight hundred sixty-seven".