161489933 has 4 divisors (see below), whose sum is σ = 176170848. Its totient is φ = 146809020.

The previous prime is 161489929. The next prime is 161489957. The reversal of 161489933 is 339984161.

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 161489933 - 2² = 161489929 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161489963) 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, 7340441 + ... + 7340462.

It is an arithmetic number, because the mean of its divisors is an integer number (44042712).

Almost surely, 2^161489933 is an apocalyptic number.

It is an amenable number.

161489933 is a deficient number, since it is larger than the sum of its proper divisors (14680915).

161489933 is a wasteful number, since it uses less digits than its factorization.

161489933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14680914.

The product of its digits is 139968, while the sum is 44.

The square root of 161489933 is about 12707.8689401489. The cubic root of 161489933 is about 544.5634446977.

It can be divided in two parts, 161 and 489933, that added together give a palindrome (490094).

The spelling of 161489933 in words is "one hundred sixty-one million, four hundred eighty-nine thousand, nine hundred thirty-three".