613220161 has 4 divisors (see below), whose sum is σ = 613273024. Its totient is φ = 613167300.

The previous prime is 613220137. The next prime is 613220189. The reversal of 613220161 is 161022316.

613220161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 613220161 - 2²⁵ = 579665729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613220131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 645 + ... + 35026.

It is an arithmetic number, because the mean of its divisors is an integer number (153318256).

Almost surely, 2^613220161 is an apocalyptic number.

It is an amenable number.

613220161 is a deficient number, since it is larger than the sum of its proper divisors (52863).

613220161 is a wasteful number, since it uses less digits than its factorization.

613220161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52862.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 613220161 is about 24763.2825166616. The cubic root of 613220161 is about 849.5823373682.

Adding to 613220161 its reverse (161022316), we get a palindrome (774242477).

The spelling of 613220161 in words is "six hundred thirteen million, two hundred twenty thousand, one hundred sixty-one".