51506759 has 4 divisors (see below), whose sum is σ = 51536160. Its totient is φ = 51477360.

The previous prime is 51506731. The next prime is 51506797. The reversal of 51506759 is 95760515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95760515 = 5 ⋅19152103.

It is a cyclic number.

It is not a de Polignac number, because 51506759 - 2⁸ = 51506503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51506459) 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, 11894 + ... + 15635.

It is an arithmetic number, because the mean of its divisors is an integer number (12884040).

Almost surely, 2^51506759 is an apocalyptic number.

51506759 is a deficient number, since it is larger than the sum of its proper divisors (29401).

51506759 is a wasteful number, since it uses less digits than its factorization.

51506759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29400.

The product of its (nonzero) digits is 47250, while the sum is 38.

The square root of 51506759 is about 7176.8209535978. The cubic root of 51506759 is about 372.0672186506.

The spelling of 51506759 in words is "fifty-one million, five hundred six thousand, seven hundred fifty-nine".