611241561 has 12 divisors (see below), whose sum is σ = 1009033792. Its totient is φ = 349280856.

The previous prime is 611241551. The next prime is 611241569. The reversal of 611241561 is 165142116.

611241561 is a `hidden beast` number, since 61 + 1 + 2 + 41 + 561 = 666.

It is not a de Polignac number, because 611241561 - 2¹⁰ = 611240537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611241569) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4851061 + ... + 4851186.

Almost surely, 2^611241561 is an apocalyptic number.

It is an amenable number.

611241561 is a deficient number, since it is larger than the sum of its proper divisors (397792231).

611241561 is a wasteful number, since it uses less digits than its factorization.

611241561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9702260 (or 9702257 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 611241561 is about 24723.2999617769. The cubic root of 611241561 is about 848.6676061908.

Adding to 611241561 its reverse (165142116), we get a palindrome (776383677).

The spelling of 611241561 in words is "six hundred eleven million, two hundred forty-one thousand, five hundred sixty-one".