51440761 has 4 divisors (see below), whose sum is σ = 51462400. Its totient is φ = 51419124.

The previous prime is 51440737. The next prime is 51440777. The reversal of 51440761 is 16704415.

51440761 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 a cyclic number.

It is not a de Polignac number, because 51440761 - 2⁵ = 51440729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51440731) 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, 6741 + ... + 12178.

It is an arithmetic number, because the mean of its divisors is an integer number (12865600).

Almost surely, 2^51440761 is an apocalyptic number.

It is an amenable number.

51440761 is a deficient number, since it is larger than the sum of its proper divisors (21639).

51440761 is a wasteful number, since it uses less digits than its factorization.

51440761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21638.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 51440761 is about 7172.2214829159. The cubic root of 51440761 is about 371.9082350637.

The spelling of 51440761 in words is "fifty-one million, four hundred forty thousand, seven hundred sixty-one".