33156161 has 4 divisors (see below), whose sum is σ = 33211392. Its totient is φ = 33100932.

The previous prime is 33156157. The next prime is 33156187. The reversal of 33156161 is 16165133.

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: 16165133 = 47 ⋅343939.

It is a cyclic number.

It is not a de Polignac number, because 33156161 - 2² = 33156157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33156161.

It is not an unprimeable number, because it can be changed into a prime (33156131) 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, 26705 + ... + 27918.

It is an arithmetic number, because the mean of its divisors is an integer number (8302848).

Almost surely, 2^33156161 is an apocalyptic number.

It is an amenable number.

33156161 is a deficient number, since it is larger than the sum of its proper divisors (55231).

33156161 is an equidigital number, since it uses as much as digits as its factorization.

33156161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55230.

The product of its digits is 1620, while the sum is 26.

The square root of 33156161 is about 5758.1386749539. The cubic root of 33156161 is about 321.2585882931.

The spelling of 33156161 in words is "thirty-three million, one hundred fifty-six thousand, one hundred sixty-one".