51499585 has 4 divisors (see below), whose sum is σ = 61799508. Its totient is φ = 41199664.

The previous prime is 51499571. The next prime is 51499589. The reversal of 51499585 is 58599415.

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 16842816 + 34656769 = 4104^2 + 5887^2 .

It is a cyclic number.

It is not a de Polignac number, because 51499585 - 2⁷ = 51499457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51499589) 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, 5149954 + ... + 5149963.

It is an arithmetic number, because the mean of its divisors is an integer number (15449877).

Almost surely, 2^51499585 is an apocalyptic number.

It is an amenable number.

51499585 is a deficient number, since it is larger than the sum of its proper divisors (10299923).

51499585 is a wasteful number, since it uses less digits than its factorization.

51499585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10299922.

The product of its digits is 324000, while the sum is 46.

The square root of 51499585 is about 7176.3211327253. The cubic root of 51499585 is about 372.0499436740.

The spelling of 51499585 in words is "fifty-one million, four hundred ninety-nine thousand, five hundred eighty-five".