161562871 has 4 divisors (see below), whose sum is σ = 170066200. Its totient is φ = 153059544.

The previous prime is 161562859. The next prime is 161562887. The reversal of 161562871 is 178265161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178265161 = 3527 ⋅50543.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161562871 is a prime.

It is a super-2 number, since 2×161562871² = 52205122571525282, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161562871.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161562811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4251636 + ... + 4251673.

It is an arithmetic number, because the mean of its divisors is an integer number (42516550).

Almost surely, 2^161562871 is an apocalyptic number.

161562871 is a deficient number, since it is larger than the sum of its proper divisors (8503329).

161562871 is an equidigital number, since it uses as much as digits as its factorization.

161562871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8503328.

The product of its digits is 20160, while the sum is 37.

The square root of 161562871 is about 12710.7384128539. The cubic root of 161562871 is about 544.6454175891.

The spelling of 161562871 in words is "one hundred sixty-one million, five hundred sixty-two thousand, eight hundred seventy-one".