161604233 has 8 divisors (see below), whose sum is σ = 192720768. Its totient is φ = 132495264.

The previous prime is 161604199. The next prime is 161604239. The reversal of 161604233 is 332406161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161604233 - 2⁸ = 161603977 is a prime.

It is a super-3 number, since 3×161604233³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161604239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501716 + ... + 502037.

It is an arithmetic number, because the mean of its divisors is an integer number (24090096).

Almost surely, 2^161604233 is an apocalyptic number.

It is an amenable number.

161604233 is a deficient number, since it is larger than the sum of its proper divisors (31116535).

161604233 is a wasteful number, since it uses less digits than its factorization.

161604233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003783.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 161604233 is about 12712.3653581857. The cubic root of 161604233 is about 544.6918921729.

The spelling of 161604233 in words is "one hundred sixty-one million, six hundred four thousand, two hundred thirty-three".