51387089 has 8 divisors (see below), whose sum is σ = 55831272. Its totient is φ = 47013120.

The previous prime is 51387059. The next prime is 51387097. The reversal of 51387089 is 98078315.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 478864 + 50908225 = 692^2 + 7135^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51387089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51387019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16022 + ... + 18959.

It is an arithmetic number, because the mean of its divisors is an integer number (6978909).

Almost surely, 2^51387089 is an apocalyptic number.

It is an amenable number.

51387089 is a deficient number, since it is larger than the sum of its proper divisors (4444183).

51387089 is a wasteful number, since it uses less digits than its factorization.

51387089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35107.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 51387089 is about 7168.4788484029. The cubic root of 51387089 is about 371.7788434767.

The spelling of 51387089 in words is "fifty-one million, three hundred eighty-seven thousand, eighty-nine".