181481413 has 8 divisors (see below), whose sum is σ = 183824640. Its totient is φ = 179145120.

The previous prime is 181481401. The next prime is 181481423. The reversal of 181481413 is 314184181.

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-181481413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181481423) 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, 68748 + ... + 71338.

It is an arithmetic number, because the mean of its divisors is an integer number (22978080).

Almost surely, 2^181481413 is an apocalyptic number.

It is an amenable number.

181481413 is a deficient number, since it is larger than the sum of its proper divisors (2343227).

181481413 is an equidigital number, since it uses as much as digits as its factorization.

181481413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3467.

The product of its digits is 3072, while the sum is 31.

The square root of 181481413 is about 13471.5037393752. The cubic root of 181481413 is about 566.1663462002.

The spelling of 181481413 in words is "one hundred eighty-one million, four hundred eighty-one thousand, four hundred thirteen".