161331145 has 8 divisors (see below), whose sum is σ = 193697280. Its totient is φ = 128998320.

The previous prime is 161331143. The next prime is 161331217. The reversal of 161331145 is 541133161.

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

It is not a de Polignac number, because 161331145 - 2¹ = 161331143 is a prime.

It is a super-2 number, since 2×161331145² = 52055476694022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161331143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3990 + ... + 18400.

It is an arithmetic number, because the mean of its divisors is an integer number (24212160).

Almost surely, 2^161331145 is an apocalyptic number.

It is an amenable number.

161331145 is a deficient number, since it is larger than the sum of its proper divisors (32366135).

161331145 is a wasteful number, since it uses less digits than its factorization.

161331145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16655.

The product of its digits is 1080, while the sum is 25.

The square root of 161331145 is about 12701.6197785952. The cubic root of 161331145 is about 544.3849020991.

The spelling of 161331145 in words is "one hundred sixty-one million, three hundred thirty-one thousand, one hundred forty-five".