161275885 has 8 divisors (see below), whose sum is σ = 201945600. Its totient is φ = 123411024.

The previous prime is 161275871. The next prime is 161275897. The reversal of 161275885 is 588572161.

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 161275885 - 2⁵ = 161275853 is a prime.

It is a super-2 number, since 2×161275885² = 52019822165066450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 701085 + ... + 701314.

It is an arithmetic number, because the mean of its divisors is an integer number (25243200).

Almost surely, 2^161275885 is an apocalyptic number.

It is an amenable number.

161275885 is a deficient number, since it is larger than the sum of its proper divisors (40669715).

161275885 is a wasteful number, since it uses less digits than its factorization.

161275885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402427.

The product of its digits is 134400, while the sum is 43.

The square root of 161275885 is about 12699.4442791801. Note that the first 3 decimals coincide. The cubic root of 161275885 is about 544.3227397992.

The spelling of 161275885 in words is "one hundred sixty-one million, two hundred seventy-five thousand, eight hundred eighty-five".