605615561 has 4 divisors (see below), whose sum is σ = 608028624. Its totient is φ = 603202500.

The previous prime is 605615513. The next prime is 605615567. The reversal of 605615561 is 165516506.

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: 165516506 = 2 ⋅82758253.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-605615561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (605615567) 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, 1206155 + ... + 1206656.

It is an arithmetic number, because the mean of its divisors is an integer number (152007156).

Almost surely, 2^605615561 is an apocalyptic number.

It is an amenable number.

605615561 is a deficient number, since it is larger than the sum of its proper divisors (2413063).

605615561 is a wasteful number, since it uses less digits than its factorization.

605615561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2413062.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 605615561 is about 24609.2576279741. The cubic root of 605615561 is about 846.0558029053.

The spelling of 605615561 in words is "six hundred five million, six hundred fifteen thousand, five hundred sixty-one".