161121175 has 6 divisors (see below), whose sum is σ = 199790288. Its totient is φ = 128896920.

The previous prime is 161121173. The next prime is 161121221. The reversal of 161121175 is 571121161.

161121175 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161121175 - 2¹ = 161121173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 6444847 = 161121175 / (1 + 6 + 1 + 1 + 2 + 1 + 1 + 7 + 5).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161121173) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3222399 + ... + 3222448.

Almost surely, 2^161121175 is an apocalyptic number.

161121175 is a deficient number, since it is larger than the sum of its proper divisors (38669113).

161121175 is an equidigital number, since it uses as much as digits as its factorization.

161121175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6444857 (or 6444852 counting only the distinct ones).

The product of its digits is 420, while the sum is 25.

The square root of 161121175 is about 12693.3516062544. The cubic root of 161121175 is about 544.1486300466.

The spelling of 161121175 in words is "one hundred sixty-one million, one hundred twenty-one thousand, one hundred seventy-five".