161040013 has 4 divisors (see below), whose sum is σ = 161069308. Its totient is φ = 161010720.

The previous prime is 161039981. The next prime is 161040041. The reversal of 161040013 is 310040161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49589764 + 111450249 = 7042^2 + 10557^2 .

It is a cyclic number.

It is not a de Polignac number, because 161040013 - 2⁵ = 161039981 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 (161040073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3648 + ... + 18313.

It is an arithmetic number, because the mean of its divisors is an integer number (40267327).

Almost surely, 2^161040013 is an apocalyptic number.

It is an amenable number.

161040013 is a deficient number, since it is larger than the sum of its proper divisors (29295).

161040013 is an equidigital number, since it uses as much as digits as its factorization.

161040013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29294.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 161040013 is about 12690.1541755804. The cubic root of 161040013 is about 544.0572462194.

Adding to 161040013 its reverse (310040161), we get a palindrome (471080174).

The spelling of 161040013 in words is "one hundred sixty-one million, forty thousand, thirteen".