51000749 has 4 divisors (see below), whose sum is σ = 51021564. Its totient is φ = 50979936.

The previous prime is 51000737. The next prime is 51000751. The reversal of 51000749 is 94700015.

51000749 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 11222500 + 39778249 = 3350^2 + 6307^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51000749 is a prime.

It is a super-2 number, since 2×51000749² = 5202152797122002, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000049) 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, 6152 + ... + 11825.

It is an arithmetic number, because the mean of its divisors is an integer number (12755391).

Almost surely, 2^51000749 is an apocalyptic number.

It is an amenable number.

51000749 is a deficient number, since it is larger than the sum of its proper divisors (20815).

51000749 is a wasteful number, since it uses less digits than its factorization.

51000749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20814.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 51000749 is about 7141.4808688395. The cubic root of 51000749 is about 370.8447923517.

The spelling of 51000749 in words is "fifty-one million, seven hundred forty-nine", and thus it is an aban number.