161115405 has 16 divisors (see below), whose sum is σ = 281219904. Its totient is φ = 78116480.

The previous prime is 161115377. The next prime is 161115413. The reversal of 161115405 is 504511161.

161115405 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 161115405 - 2¹⁶ = 161049869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488064 + ... + 488393.

It is an arithmetic number, because the mean of its divisors is an integer number (17576244).

Almost surely, 2^161115405 is an apocalyptic number.

161115405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161115405 is a deficient number, since it is larger than the sum of its proper divisors (120104499).

161115405 is a wasteful number, since it uses less digits than its factorization.

161115405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976476.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 161115405 is about 12693.1243198828. The cubic root of 161115405 is about 544.1421343660.

Adding to 161115405 its reverse (504511161), we get a palindrome (665626566).

The spelling of 161115405 in words is "one hundred sixty-one million, one hundred fifteen thousand, four hundred five".