161204013 has 24 divisors (see below), whose sum is σ = 255685248. Its totient is φ = 101145024.

The previous prime is 161203981. The next prime is 161204027. The reversal of 161204013 is 310402161.

It is a happy number.

161204013 is a `hidden beast` number, since 1 + 612 + 0 + 40 + 13 = 666.

It is not a de Polignac number, because 161204013 - 2⁵ = 161203981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161204053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15381 + ... + 23642.

It is an arithmetic number, because the mean of its divisors is an integer number (10653552).

Almost surely, 2^161204013 is an apocalyptic number.

It is an amenable number.

161204013 is a deficient number, since it is larger than the sum of its proper divisors (94481235).

161204013 is an equidigital number, since it uses as much as digits as its factorization.

161204013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39055 (or 39043 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 161204013 is about 12696.6142337239. The cubic root of 161204013 is about 544.2418693148.

Adding to 161204013 its reverse (310402161), we get a palindrome (471606174).

The spelling of 161204013 in words is "one hundred sixty-one million, two hundred four thousand, thirteen".