161404233 has 4 divisors (see below), whose sum is σ = 215205648. Its totient is φ = 107602820.

The previous prime is 161404223. The next prime is 161404253. The reversal of 161404233 is 332404161.

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 161404233 - 2¹² = 161400137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161404213) 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, 26900703 + ... + 26900708.

It is an arithmetic number, because the mean of its divisors is an integer number (53801412).

Almost surely, 2^161404233 is an apocalyptic number.

It is an amenable number.

161404233 is a deficient number, since it is larger than the sum of its proper divisors (53801415).

161404233 is an equidigital number, since it uses as much as digits as its factorization.

161404233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53801414.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 161404233 is about 12704.4965661769. The cubic root of 161404233 is about 544.4670974223.

Adding to 161404233 its reverse (332404161), we get a palindrome (493808394).

The spelling of 161404233 in words is "one hundred sixty-one million, four hundred four thousand, two hundred thirty-three".