181674145 has 4 divisors (see below), whose sum is σ = 218008980. Its totient is φ = 145339312.

The previous prime is 181674139. The next prime is 181674191. The reversal of 181674145 is 541476181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 89283601 + 92390544 = 9449^2 + 9612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181674145 is a prime.

It is a super-2 number, since 2×181674145² = 66010989922962050, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18167410 + ... + 18167419.

It is an arithmetic number, because the mean of its divisors is an integer number (54502245).

Almost surely, 2^181674145 is an apocalyptic number.

It is an amenable number.

181674145 is a deficient number, since it is larger than the sum of its proper divisors (36334835).

181674145 is an equidigital number, since it uses as much as digits as its factorization.

181674145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36334834.

The product of its digits is 26880, while the sum is 37.

The square root of 181674145 is about 13478.6551628862. The cubic root of 181674145 is about 566.3666968689.

The spelling of 181674145 in words is "one hundred eighty-one million, six hundred seventy-four thousand, one hundred forty-five".