51345489 has 32 divisors (see below), whose sum is σ = 76374144. Its totient is φ = 30481920.

The previous prime is 51345487. The next prime is 51345521. The reversal of 51345489 is 98454315.

51345489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51345489 - 2¹ = 51345487 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51345487) 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 31 ways as a sum of consecutive naturals, for example, 260539 + ... + 260735.

It is an arithmetic number, because the mean of its divisors is an integer number (2386692).

Almost surely, 2^51345489 is an apocalyptic number.

It is an amenable number.

51345489 is a deficient number, since it is larger than the sum of its proper divisors (25028655).

51345489 is a wasteful number, since it uses less digits than its factorization.

51345489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417.

The product of its digits is 86400, while the sum is 39.

The square root of 51345489 is about 7165.5766690476. The cubic root of 51345489 is about 371.6784928794.

The spelling of 51345489 in words is "fifty-one million, three hundred forty-five thousand, four hundred eighty-nine".