161440417 has 4 divisors (see below), whose sum is σ = 161508996. Its totient is φ = 161371840.

The previous prime is 161440399. The next prime is 161440421. The reversal of 161440417 is 714044161.

161440417 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 714044161 = 1307 ⋅546323.

It can be written as a sum of positive squares in 2 ways, for example, as 70829056 + 90611361 = 8416^2 + 9519^2 .

It is a cyclic number.

It is not a de Polignac number, because 161440417 - 2¹¹ = 161438369 is a prime.

It is a super-2 number, since 2×161440417² = 52126016482267778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161440717) 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, 30628 + ... + 35509.

It is an arithmetic number, because the mean of its divisors is an integer number (40377249).

Almost surely, 2^161440417 is an apocalyptic number.

It is an amenable number.

161440417 is a deficient number, since it is larger than the sum of its proper divisors (68579).

161440417 is an equidigital number, since it uses as much as digits as its factorization.

161440417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68578.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 161440417 is about 12705.9205490984. The cubic root of 161440417 is about 544.5077810423.

Adding to 161440417 its reverse (714044161), we get a palindrome (875484578).

The spelling of 161440417 in words is "one hundred sixty-one million, four hundred forty thousand, four hundred seventeen".