5161561241 has 4 divisors (see below), whose sum is σ = 5162604132. Its totient is φ = 5160518352.

The previous prime is 5161561219. The next prime is 5161561283. The reversal of 5161561241 is 1421651615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1421651615 = 5 ⋅284330323.

It can be written as a sum of positive squares in 2 ways, for example, as 2384271241 + 2777290000 = 48829^2 + 52700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5161561241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5161561198 and 5161561207.

It is not an unprimeable number, because it can be changed into a prime (5161561541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513986 + ... + 523931.

It is an arithmetic number, because the mean of its divisors is an integer number (1290651033).

Almost surely, 2^5161561241 is an apocalyptic number.

It is an amenable number.

5161561241 is a deficient number, since it is larger than the sum of its proper divisors (1042891).

5161561241 is a wasteful number, since it uses less digits than its factorization.

5161561241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042890.

The product of its digits is 7200, while the sum is 32.

The square root of 5161561241 is about 71844.0062983684. The cubic root of 5161561241 is about 1728.1987825062.

The spelling of 5161561241 in words is "five billion, one hundred sixty-one million, five hundred sixty-one thousand, two hundred forty-one".