51041561 has 4 divisors (see below), whose sum is σ = 51056400. Its totient is φ = 51026724.

The previous prime is 51041521. The next prime is 51041569. The reversal of 51041561 is 16514015.

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 a de Polignac number, because none of the positive numbers 2^k-51041561 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 (51041569) 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, 710 + ... + 10128.

It is an arithmetic number, because the mean of its divisors is an integer number (12764100).

Almost surely, 2^51041561 is an apocalyptic number.

It is an amenable number.

51041561 is a deficient number, since it is larger than the sum of its proper divisors (14839).

51041561 is an equidigital number, since it uses as much as digits as its factorization.

51041561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14838.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 51041561 is about 7144.3376879876. The cubic root of 51041561 is about 370.9436855552.

Adding to 51041561 its reverse (16514015), we get a palindrome (67555576).

The spelling of 51041561 in words is "fifty-one million, forty-one thousand, five hundred sixty-one".