161146221 has 8 divisors (see below), whose sum is σ = 219433344. Its totient is φ = 105144960.

The previous prime is 161146217. The next prime is 161146229. The reversal of 161146221 is 122641161.

It is a happy number.

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

It is not a de Polignac number, because 161146221 - 2² = 161146217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161146191 and 161146200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161146229) 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, 571300 + ... + 571581.

It is an arithmetic number, because the mean of its divisors is an integer number (27429168).

Almost surely, 2^161146221 is an apocalyptic number.

It is an amenable number.

161146221 is a deficient number, since it is larger than the sum of its proper divisors (58287123).

161146221 is a wasteful number, since it uses less digits than its factorization.

161146221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142931.

The product of its digits is 576, while the sum is 24.

The square root of 161146221 is about 12694.3381473789. The cubic root of 161146221 is about 544.1768242312.

Adding to 161146221 its reverse (122641161), we get a palindrome (283787382).

The spelling of 161146221 in words is "one hundred sixty-one million, one hundred forty-six thousand, two hundred twenty-one".