161278339 has 4 divisors (see below), whose sum is σ = 161387856. Its totient is φ = 161168824.

The previous prime is 161278331. The next prime is 161278343. The reversal of 161278339 is 933872161.

161278339 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: 933872161 = 293 ⋅3187277.

It is a cyclic number.

It is not a de Polignac number, because 161278339 - 2³ = 161278331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161278331) 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, 52519 + ... + 55504.

It is an arithmetic number, because the mean of its divisors is an integer number (40346964).

Almost surely, 2^161278339 is an apocalyptic number.

161278339 is a deficient number, since it is larger than the sum of its proper divisors (109517).

161278339 is a wasteful number, since it uses less digits than its factorization.

161278339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109516.

The product of its digits is 54432, while the sum is 40.

The square root of 161278339 is about 12699.5408972136. The cubic root of 161278339 is about 544.3255006196.

The spelling of 161278339 in words is "one hundred sixty-one million, two hundred seventy-eight thousand, three hundred thirty-nine".