161161613 has 4 divisors (see below), whose sum is σ = 166718940. Its totient is φ = 155604288.

The previous prime is 161161607. The next prime is 161161619. The reversal of 161161613 is 316161161.

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

It is an interprime number because it is at equal distance from previous prime (161161607) and next prime (161161619).

It can be written as a sum of positive squares in 2 ways, for example, as 134977924 + 26183689 = 11618^2 + 5117^2 .

It is a cyclic number.

It is not a de Polignac number, because 161161613 - 2⁴ = 161161597 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 (161161619) 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, 2778620 + ... + 2778677.

It is an arithmetic number, because the mean of its divisors is an integer number (41679735).

Almost surely, 2^161161613 is an apocalyptic number.

It is an amenable number.

161161613 is a deficient number, since it is larger than the sum of its proper divisors (5557327).

161161613 is an equidigital number, since it uses as much as digits as its factorization.

161161613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5557326.

The product of its digits is 648, while the sum is 26.

The square root of 161161613 is about 12694.9443874323. The cubic root of 161161613 is about 544.1941494963.

The spelling of 161161613 in words is "one hundred sixty-one million, one hundred sixty-one thousand, six hundred thirteen".