161199939 has 16 divisors (see below), whose sum is σ = 226508544. Its totient is φ = 101772000.

The previous prime is 161199919. The next prime is 161199947. The reversal of 161199939 is 939991161.

It is not a de Polignac number, because 161199939 - 2¹³ = 161191747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161199919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4597 + ... + 18534.

It is an arithmetic number, because the mean of its divisors is an integer number (14156784).

Almost surely, 2^161199939 is an apocalyptic number.

161199939 is a deficient number, since it is larger than the sum of its proper divisors (65308605).

161199939 is a wasteful number, since it uses less digits than its factorization.

161199939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23258.

The product of its digits is 118098, while the sum is 48.

The square root of 161199939 is about 12696.4537962378. The cubic root of 161199939 is about 544.2372845239.

The spelling of 161199939 in words is "one hundred sixty-one million, one hundred ninety-nine thousand, nine hundred thirty-nine".