33161218 has 4 divisors (see below), whose sum is σ = 49741830. Its totient is φ = 16580608.

The previous prime is 33161201. The next prime is 33161231. The reversal of 33161218 is 81216133.

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

It can be written as a sum of positive squares in only one way, i.e., 30991489 + 2169729 = 5567^2 + 1473^2 .

It is a junction number, because it is equal to n+sod(n) for n = 33161192 and 33161201.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8290303 + ... + 8290306.

Almost surely, 2^33161218 is an apocalyptic number.

33161218 is a deficient number, since it is larger than the sum of its proper divisors (16580612).

33161218 is a wasteful number, since it uses less digits than its factorization.

33161218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16580611.

The product of its digits is 864, while the sum is 25.

The square root of 33161218 is about 5758.5777758054. The cubic root of 33161218 is about 321.2749203215.

The spelling of 33161218 in words is "thirty-three million, one hundred sixty-one thousand, two hundred eighteen".