161311239 has 12 divisors (see below), whose sum is σ = 236197936. Its totient is φ = 106067232.

The previous prime is 161311237. The next prime is 161311279. The reversal of 161311239 is 932113161.

161311239 is a `hidden beast` number, since 1 + 613 + 1 + 12 + 39 = 666.

161311239 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 161311239 - 2¹ = 161311237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161311237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 122107 + ... + 123420.

Almost surely, 2^161311239 is an apocalyptic number.

161311239 is a deficient number, since it is larger than the sum of its proper divisors (74886697).

161311239 is a wasteful number, since it uses less digits than its factorization.

161311239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245606 (or 245603 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 161311239 is about 12700.8361535767. The cubic root of 161311239 is about 544.3625113582.

The spelling of 161311239 in words is "one hundred sixty-one million, three hundred eleven thousand, two hundred thirty-nine".