161207869 has 4 divisors (see below), whose sum is σ = 161235900. Its totient is φ = 161179840.

The previous prime is 161207867. The next prime is 161207881. The reversal of 161207869 is 968702161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34082244 + 127125625 = 5838^2 + 11275^2 .

It is a cyclic number.

It is not a de Polignac number, because 161207869 - 2¹ = 161207867 is a prime.

It is a super-2 number, since 2×161207869² = 51975954055042322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161207863) 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 3 ways as a sum of consecutive naturals, for example, 1894 + ... + 18055.

It is an arithmetic number, because the mean of its divisors is an integer number (40308975).

Almost surely, 2^161207869 is an apocalyptic number.

It is an amenable number.

161207869 is a deficient number, since it is larger than the sum of its proper divisors (28031).

161207869 is an equidigital number, since it uses as much as digits as its factorization.

161207869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28030.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 161207869 is about 12696.7660843224. The cubic root of 161207869 is about 544.2462087020.

The spelling of 161207869 in words is "one hundred sixty-one million, two hundred seven thousand, eight hundred sixty-nine".