161331602 has 8 divisors (see below), whose sum is σ = 242051916. Its totient is φ = 80647632.

The previous prime is 161331593. The next prime is 161331607. The reversal of 161331602 is 206133161.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 145419481 + 15912121 = 12059^2 + 3989^2 .

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

It is not an unprimeable number, because it can be changed into a prime (161331607) 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, 10208 + ... + 20660.

Almost surely, 2^161331602 is an apocalyptic number.

161331602 is a deficient number, since it is larger than the sum of its proper divisors (80720314).

161331602 is a wasteful number, since it uses less digits than its factorization.

161331602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18172.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 161331602 is about 12701.6377684140. The cubic root of 161331602 is about 544.3854161219.

Adding to 161331602 its reverse (206133161), we get a palindrome (367464763).

The spelling of 161331602 in words is "one hundred sixty-one million, three hundred thirty-one thousand, six hundred two".