161121369 has 8 divisors (see below), whose sum is σ = 217548160. Its totient is φ = 106054416.

The previous prime is 161121329. The next prime is 161121377. The reversal of 161121369 is 963121161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161121369 - 2¹³ = 161113177 is a prime.

It is a super-2 number, since 2×161121369² = 51920191096868322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161121329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339682 + ... + 340155.

It is an arithmetic number, because the mean of its divisors is an integer number (27193520).

Almost surely, 2^161121369 is an apocalyptic number.

It is an amenable number.

161121369 is a deficient number, since it is larger than the sum of its proper divisors (56426791).

161121369 is an equidigital number, since it uses as much as digits as its factorization.

161121369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679919.

The product of its digits is 1944, while the sum is 30.

The square root of 161121369 is about 12693.3592480478. The cubic root of 161121369 is about 544.1488484428.

The spelling of 161121369 in words is "one hundred sixty-one million, one hundred twenty-one thousand, three hundred sixty-nine".