161916115 has 4 divisors (see below), whose sum is σ = 194299344. Its totient is φ = 129532888.

The previous prime is 161916049. The next prime is 161916169. The reversal of 161916115 is 511619161.

161916115 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: 511619161 = 22619².

It is a cyclic number.

It is not a de Polignac number, because 161916115 - 2¹⁹ = 161391827 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16191607 + ... + 16191616.

It is an arithmetic number, because the mean of its divisors is an integer number (48574836).

Almost surely, 2^161916115 is an apocalyptic number.

161916115 is a deficient number, since it is larger than the sum of its proper divisors (32383229).

161916115 is an equidigital number, since it uses as much as digits as its factorization.

161916115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32383228.

The product of its digits is 1620, while the sum is 31.

The square root of 161916115 is about 12724.6263206430. The cubic root of 161916115 is about 545.0420695298.

The spelling of 161916115 in words is "one hundred sixty-one million, nine hundred sixteen thousand, one hundred fifteen".