51999457 has 4 divisors (see below), whose sum is σ = 52130836. Its totient is φ = 51868080.

The previous prime is 51999397. The next prime is 51999463. The reversal of 51999457 is 75499915.

51999457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 13571856 + 38427601 = 3684^2 + 6199^2 .

It is a cyclic number.

It is not a de Polignac number, because 51999457 - 2⁷ = 51999329 is a prime.

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 51999457.

It is not an unprimeable number, because it can be changed into a prime (51993457) 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 3 ways as a sum of consecutive naturals, for example, 65094 + ... + 65887.

It is an arithmetic number, because the mean of its divisors is an integer number (13032709).

Almost surely, 2^51999457 is an apocalyptic number.

It is an amenable number.

51999457 is a deficient number, since it is larger than the sum of its proper divisors (131379).

51999457 is a wasteful number, since it uses less digits than its factorization.

51999457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131378.

The product of its digits is 510300, while the sum is 49.

The square root of 51999457 is about 7211.0649005539. The cubic root of 51999457 is about 373.2498164762.

The spelling of 51999457 in words is "fifty-one million, nine hundred ninety-nine thousand, four hundred fifty-seven".