605161561 has 4 divisors (see below), whose sum is σ = 605342592. Its totient is φ = 604980532.

The previous prime is 605161553. The next prime is 605161573. The reversal of 605161561 is 165161506.

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 an emirpimes, since its reverse is a distinct semiprime: 165161506 = 2 ⋅82580753.

It is a cyclic number.

It is not a de Polignac number, because 605161561 - 2³ = 605161553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (605161961) 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, 85405 + ... + 92218.

It is an arithmetic number, because the mean of its divisors is an integer number (151335648).

Almost surely, 2^605161561 is an apocalyptic number.

It is an amenable number.

605161561 is a deficient number, since it is larger than the sum of its proper divisors (181031).

605161561 is a wasteful number, since it uses less digits than its factorization.

605161561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181030.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 605161561 is about 24600.0317276218. The cubic root of 605161561 is about 845.8443346727.

The spelling of 605161561 in words is "six hundred five million, one hundred sixty-one thousand, five hundred sixty-one".