51456561 has 8 divisors (see below), whose sum is σ = 73886400. Its totient is φ = 31665552.

The previous prime is 51456551. The next prime is 51456563. The reversal of 51456561 is 16565415.

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

It is not a de Polignac number, because 51456561 - 2⁹ = 51456049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51456563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659661 + ... + 659738.

It is an arithmetic number, because the mean of its divisors is an integer number (9235800).

Almost surely, 2^51456561 is an apocalyptic number.

It is an amenable number.

51456561 is a deficient number, since it is larger than the sum of its proper divisors (22429839).

51456561 is a wasteful number, since it uses less digits than its factorization.

51456561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319415.

The product of its digits is 18000, while the sum is 33.

The square root of 51456561 is about 7173.3228701906. The cubic root of 51456561 is about 371.9463082990.

It can be divided in two parts, 514 and 56561, that added together give a palindrome (57075).

The spelling of 51456561 in words is "fifty-one million, four hundred fifty-six thousand, five hundred sixty-one".