51440749 has 8 divisors (see below), whose sum is σ = 53650688. Its totient is φ = 49265280.

The previous prime is 51440737. The next prime is 51440777. The reversal of 51440749 is 94704415.

51440749 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51440749 - 2⁹ = 51440237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51440729) 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 7 ways as a sum of consecutive naturals, for example, 5547 + ... + 11560.

It is an arithmetic number, because the mean of its divisors is an integer number (6706336).

Almost surely, 2^51440749 is an apocalyptic number.

It is an amenable number.

51440749 is a deficient number, since it is larger than the sum of its proper divisors (2209939).

51440749 is a wasteful number, since it uses less digits than its factorization.

51440749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17235.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 51440749 is about 7172.2206463549. The cubic root of 51440749 is about 371.9082061443.

The spelling of 51440749 in words is "fifty-one million, four hundred forty thousand, seven hundred forty-nine".