161517233 has 4 divisors (see below), whose sum is σ = 170018160. Its totient is φ = 153016308.

The previous prime is 161517229. The next prime is 161517241. The reversal of 161517233 is 332715161.

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: 332715161 = 2131 ⋅156131.

It is a cyclic number.

It is not a de Polignac number, because 161517233 - 2² = 161517229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161517196 and 161517205.

It is not an unprimeable number, because it can be changed into a prime (161517133) 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, 4250435 + ... + 4250472.

It is an arithmetic number, because the mean of its divisors is an integer number (42504540).

Almost surely, 2^161517233 is an apocalyptic number.

It is an amenable number.

161517233 is a deficient number, since it is larger than the sum of its proper divisors (8500927).

161517233 is an equidigital number, since it uses as much as digits as its factorization.

161517233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8500926.

The product of its digits is 3780, while the sum is 29.

The square root of 161517233 is about 12708.9430323690. The cubic root of 161517233 is about 544.5941292614.

The spelling of 161517233 in words is "one hundred sixty-one million, five hundred seventeen thousand, two hundred thirty-three".