51128289 has 6 divisors (see below), whose sum is σ = 73851986. Its totient is φ = 34085520.

The previous prime is 51128281. The next prime is 51128291. The reversal of 51128289 is 98282115.

It can be written as a sum of positive squares in only one way, i.e., 29811600 + 21316689 = 5460^2 + 4617^2 .

It is not a de Polignac number, because 51128289 - 2³ = 51128281 is a prime.

It is a super-2 number, since 2×51128289² = 5228203872135042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51128281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2840452 + ... + 2840469.

Almost surely, 2^51128289 is an apocalyptic number.

It is an amenable number.

51128289 is a deficient number, since it is larger than the sum of its proper divisors (22723697).

51128289 is a wasteful number, since it uses less digits than its factorization.

51128289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5680927 (or 5680924 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 51128289 is about 7150.4048137151. The cubic root of 51128289 is about 371.1536647638.

The spelling of 51128289 in words is "fifty-one million, one hundred twenty-eight thousand, two hundred eighty-nine".