51128597 has 4 divisors (see below), whose sum is σ = 55061580. Its totient is φ = 47195616.

The previous prime is 51128569. The next prime is 51128611. The reversal of 51128597 is 79582115.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13256881 + 37871716 = 3641^2 + 6154^2 .

It is not a de Polignac number, because 51128597 - 2¹² = 51124501 is a prime.

It is a super-2 number, since 2×51128597² = 5228266862376818, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51128597.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51128897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966472 + ... + 1966497.

It is an arithmetic number, because the mean of its divisors is an integer number (13765395).

Almost surely, 2^51128597 is an apocalyptic number.

It is an amenable number.

51128597 is a deficient number, since it is larger than the sum of its proper divisors (3932983).

51128597 is a wasteful number, since it uses less digits than its factorization.

51128597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932982.

The product of its digits is 25200, while the sum is 38.

The square root of 51128597 is about 7150.4263509248. The cubic root of 51128597 is about 371.1544100466.

The spelling of 51128597 in words is "fifty-one million, one hundred twenty-eight thousand, five hundred ninety-seven".