181356121 has 8 divisors (see below), whose sum is σ = 191632320. Its totient is φ = 171153072.

The previous prime is 181356103. The next prime is 181356139. The reversal of 181356121 is 121653181.

It is an interprime number because it is at equal distance from previous prime (181356103) and next prime (181356139).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181356121 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181356121.

It is not an unprimeable number, because it can be changed into a prime (181356151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13150 + ... + 23143.

It is an arithmetic number, because the mean of its divisors is an integer number (23954040).

Almost surely, 2^181356121 is an apocalyptic number.

It is an amenable number.

181356121 is a deficient number, since it is larger than the sum of its proper divisors (10276199).

181356121 is a wasteful number, since it uses less digits than its factorization.

181356121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36575.

The product of its digits is 1440, while the sum is 28.

The square root of 181356121 is about 13466.8526761081. The cubic root of 181356121 is about 566.0360253346.

The spelling of 181356121 in words is "one hundred eighty-one million, three hundred fifty-six thousand, one hundred twenty-one".