181802002 has 4 divisors (see below), whose sum is σ = 272703006. Its totient is φ = 90901000.

The previous prime is 181801999. The next prime is 181802017. The reversal of 181802002 is 200208181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 200208181 = 59 ⋅3393359.

It can be written as a sum of positive squares in only one way, i.e., 178195801 + 3606201 = 13349^2 + 1899^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45450499 + ... + 45450502.

Almost surely, 2^181802002 is an apocalyptic number.

181802002 is a deficient number, since it is larger than the sum of its proper divisors (90901004).

181802002 is an equidigital number, since it uses as much as digits as its factorization.

181802002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90901003.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 181802002 is about 13483.3972722011. The cubic root of 181802002 is about 566.4995298702.

The spelling of 181802002 in words is "one hundred eighty-one million, eight hundred two thousand, two".