51040561 has 8 divisors (see below), whose sum is σ = 59963904. Its totient is φ = 42831120.

The previous prime is 51040547. The next prime is 51040573. The reversal of 51040561 is 16504015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51040561 - 2⁷ = 51040433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51040541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178321 + ... + 178606.

It is an arithmetic number, because the mean of its divisors is an integer number (7495488).

Almost surely, 2^51040561 is an apocalyptic number.

It is an amenable number.

51040561 is a deficient number, since it is larger than the sum of its proper divisors (8923343).

51040561 is a wasteful number, since it uses less digits than its factorization.

51040561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356951.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 51040561 is about 7144.2677021511. The cubic root of 51040561 is about 370.9412630450.

Adding to 51040561 its reverse (16504015), we get a palindrome (67544576).

The spelling of 51040561 in words is "fifty-one million, forty thousand, five hundred sixty-one".