51757561 has 8 divisors (see below), whose sum is σ = 53832320. Its totient is φ = 49718448.

The previous prime is 51757543. The next prime is 51757579. The reversal of 51757561 is 16575715.

It is an interprime number because it is at equal distance from previous prime (51757543) and next prime (51757579).

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 51757561 - 2⁵ = 51757529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51757561.

It is not an unprimeable number, because it can be changed into a prime (51757591) 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, 5931 + ... + 11776.

It is an arithmetic number, because the mean of its divisors is an integer number (6729040).

Almost surely, 2^51757561 is an apocalyptic number.

It is an amenable number.

51757561 is a deficient number, since it is larger than the sum of its proper divisors (2074759).

51757561 is a wasteful number, since it uses less digits than its factorization.

51757561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17823.

The product of its digits is 36750, while the sum is 37.

The square root of 51757561 is about 7194.2727916031. The cubic root of 51757561 is about 372.6701437345.

The spelling of 51757561 in words is "fifty-one million, seven hundred fifty-seven thousand, five hundred sixty-one".