181049893 has 4 divisors (see below), whose sum is σ = 181098880. Its totient is φ = 181000908.

The previous prime is 181049887. The next prime is 181049933. The reversal of 181049893 is 398940181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 398940181 = 269 ⋅1483049.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181049893 is a prime.

It is a super-2 number, since 2×181049893² = 65558127510622898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181049833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18453 + ... + 26506.

It is an arithmetic number, because the mean of its divisors is an integer number (45274720).

Almost surely, 2^181049893 is an apocalyptic number.

It is an amenable number.

181049893 is a deficient number, since it is larger than the sum of its proper divisors (48987).

181049893 is an equidigital number, since it uses as much as digits as its factorization.

181049893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48986.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 181049893 is about 13455.4781780508. The cubic root of 181049893 is about 565.7172533836.

The spelling of 181049893 in words is "one hundred eighty-one million, forty-nine thousand, eight hundred ninety-three".