51776261 has 4 divisors (see below), whose sum is σ = 52234572. Its totient is φ = 51317952.

The previous prime is 51776233. The next prime is 51776267. The reversal of 51776261 is 16267715.

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 20079361 + 31696900 = 4481^2 + 5630^2 .

It is a cyclic number.

It is not a de Polignac number, because 51776261 - 2¹⁸ = 51514117 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 (51776267) 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, 228986 + ... + 229211.

It is an arithmetic number, because the mean of its divisors is an integer number (13058643).

Almost surely, 2^51776261 is an apocalyptic number.

It is an amenable number.

51776261 is a deficient number, since it is larger than the sum of its proper divisors (458311).

51776261 is a wasteful number, since it uses less digits than its factorization.

51776261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458310.

The product of its digits is 17640, while the sum is 35.

The square root of 51776261 is about 7195.5723191418. The cubic root of 51776261 is about 372.7150202217.

The spelling of 51776261 in words is "fifty-one million, seven hundred seventy-six thousand, two hundred sixty-one".