161161939 has 8 divisors (see below), whose sum is σ = 167801760. Its totient is φ = 154651200.

The previous prime is 161161907. The next prime is 161161969. The reversal of 161161939 is 939161161.

161161939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161161939 - 2⁵ = 161161907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161161898 and 161161907.

It is not an unprimeable number, because it can be changed into a prime (161161969) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29719 + ... + 34720.

It is an arithmetic number, because the mean of its divisors is an integer number (20975220).

Almost surely, 2^161161939 is an apocalyptic number.

161161939 is a deficient number, since it is larger than the sum of its proper divisors (6639821).

161161939 is an equidigital number, since it uses as much as digits as its factorization.

161161939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64541.

The product of its digits is 8748, while the sum is 37.

The square root of 161161939 is about 12694.9572271828. The cubic root of 161161939 is about 544.1945164306.

The spelling of 161161939 in words is "one hundred sixty-one million, one hundred sixty-one thousand, nine hundred thirty-nine".