161113809 has 4 divisors (see below), whose sum is σ = 214818416. Its totient is φ = 107409204.

The previous prime is 161113739. The next prime is 161113817. The reversal of 161113809 is 908311161.

161113809 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 161113809 - 2¹² = 161109713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161113109) 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, 26852299 + ... + 26852304.

It is an arithmetic number, because the mean of its divisors is an integer number (53704604).

Almost surely, 2^161113809 is an apocalyptic number.

It is an amenable number.

161113809 is a deficient number, since it is larger than the sum of its proper divisors (53704607).

161113809 is an equidigital number, since it uses as much as digits as its factorization.

161113809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53704606.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 161113809 is about 12693.0614510448. The cubic root of 161113809 is about 544.1403376131.

The spelling of 161113809 in words is "one hundred sixty-one million, one hundred thirteen thousand, eight hundred nine".