181813474 has 8 divisors (see below), whose sum is σ = 272783340. Its totient is φ = 90885696.

The previous prime is 181813447. The next prime is 181813477. The reversal of 181813474 is 474318181.

It can be written as a sum of positive squares in 2 ways, for example, as 178409449 + 3404025 = 13357^2 + 1845^2 .

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

It is a super-2 number, since 2×181813474² = 66112278655897352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (181813477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4662 + ... + 19630.

Almost surely, 2^181813474 is an apocalyptic number.

181813474 is a deficient number, since it is larger than the sum of its proper divisors (90969866).

181813474 is a wasteful number, since it uses less digits than its factorization.

181813474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21044.

The product of its digits is 21504, while the sum is 37.

The square root of 181813474 is about 13483.8226775644. The cubic root of 181813474 is about 566.5114452980.

The spelling of 181813474 in words is "one hundred eighty-one million, eight hundred thirteen thousand, four hundred seventy-four".