51755261 has 4 divisors (see below), whose sum is σ = 51843132. Its totient is φ = 51667392.

The previous prime is 51755257. The next prime is 51755281. The reversal of 51755261 is 16255715.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42640900 + 9114361 = 6530^2 + 3019^2 .

It is a cyclic number.

It is not a de Polignac number, because 51755261 - 2² = 51755257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51755281) 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, 43046 + ... + 44231.

It is an arithmetic number, because the mean of its divisors is an integer number (12960783).

Almost surely, 2^51755261 is an apocalyptic number.

It is an amenable number.

51755261 is a deficient number, since it is larger than the sum of its proper divisors (87871).

51755261 is an equidigital number, since it uses as much as digits as its factorization.

51755261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87870.

The product of its digits is 10500, while the sum is 32.

The square root of 51755261 is about 7194.1129404535. The cubic root of 51755261 is about 372.6646234201.

The spelling of 51755261 in words is "fifty-one million, seven hundred fifty-five thousand, two hundred sixty-one".