51207761 has 4 divisors (see below), whose sum is σ = 55863024. Its totient is φ = 46552500.

The previous prime is 51207749. The next prime is 51207773. The reversal of 51207761 is 16770215.

51207761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (51207749) and next prime (51207773).

It is a cyclic number.

It is not a de Polignac number, because 51207761 - 2⁶ = 51207697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51207701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2327615 + ... + 2327636.

It is an arithmetic number, because the mean of its divisors is an integer number (13965756).

Almost surely, 2^51207761 is an apocalyptic number.

It is an amenable number.

51207761 is a deficient number, since it is larger than the sum of its proper divisors (4655263).

51207761 is a wasteful number, since it uses less digits than its factorization.

51207761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4655262.

The product of its (nonzero) digits is 2940, while the sum is 29.

The square root of 51207761 is about 7155.9598238112. The cubic root of 51207761 is about 371.3458679135.

Adding to 51207761 its reverse (16770215), we get a palindrome (67977976).

The spelling of 51207761 in words is "fifty-one million, two hundred seven thousand, seven hundred sixty-one".