161339285 has 8 divisors (see below), whose sum is σ = 194128440. Its totient is φ = 128723904.

The previous prime is 161339263. The next prime is 161339309. The reversal of 161339285 is 582933161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6436369 + 154902916 = 2537^2 + 12446^2 .

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 161339285 - 2¹⁸ = 161077141 is a prime.

It is a super-2 number, since 2×161339285² = 52060729768622450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 41390 + ... + 45119.

It is an arithmetic number, because the mean of its divisors is an integer number (24266055).

Almost surely, 2^161339285 is an apocalyptic number.

It is an amenable number.

161339285 is a deficient number, since it is larger than the sum of its proper divisors (32789155).

161339285 is an equidigital number, since it uses as much as digits as its factorization.

161339285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86887.

The product of its digits is 38880, while the sum is 38.

The square root of 161339285 is about 12701.9402061260. The cubic root of 161339285 is about 544.3940576336.

The spelling of 161339285 in words is "one hundred sixty-one million, three hundred thirty-nine thousand, two hundred eighty-five".