161120417 has 4 divisors (see below), whose sum is σ = 163327620. Its totient is φ = 158913216.

The previous prime is 161120413. The next prime is 161120419. The reversal of 161120417 is 714021161.

It is a happy number.

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 128504896 + 32615521 = 11336^2 + 5711^2 .

It is a cyclic number.

It is not a de Polignac number, because 161120417 - 2² = 161120413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161120392 and 161120401.

It is not an unprimeable number, because it can be changed into a prime (161120411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1103492 + ... + 1103637.

It is an arithmetic number, because the mean of its divisors is an integer number (40831905).

Almost surely, 2^161120417 is an apocalyptic number.

It is an amenable number.

161120417 is a deficient number, since it is larger than the sum of its proper divisors (2207203).

161120417 is an equidigital number, since it uses as much as digits as its factorization.

161120417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2207202.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 161120417 is about 12693.3217480689. The cubic root of 161120417 is about 544.1477767234.

Adding to 161120417 its reverse (714021161), we get a palindrome (875141578).

The spelling of 161120417 in words is "one hundred sixty-one million, one hundred twenty thousand, four hundred seventeen".