161021233 has 4 divisors (see below), whose sum is σ = 161985600. Its totient is φ = 160056868.

The previous prime is 161021221. The next prime is 161021323. The reversal of 161021233 is 332120161.

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.

It is a cyclic number.

It is not a de Polignac number, because 161021233 - 2⁹ = 161020721 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 161021233.

It is not an unprimeable number, because it can be changed into a prime (161021933) 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, 481933 + ... + 482266.

It is an arithmetic number, because the mean of its divisors is an integer number (40496400).

Almost surely, 2^161021233 is an apocalyptic number.

It is an amenable number.

161021233 is a deficient number, since it is larger than the sum of its proper divisors (964367).

161021233 is an equidigital number, since it uses as much as digits as its factorization.

161021233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964366.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 161021233 is about 12689.4142102778. The cubic root of 161021233 is about 544.0360966262.

Adding to 161021233 its reverse (332120161), we get a palindrome (493141394).

The spelling of 161021233 in words is "one hundred sixty-one million, twenty-one thousand, two hundred thirty-three".