51729505 has 8 divisors (see below), whose sum is σ = 62244072. Its totient is φ = 41271168.

The previous prime is 51729499. The next prime is 51729511. The reversal of 51729505 is 50592715.

It is an interprime number because it is at equal distance from previous prime (51729499) and next prime (51729511).

It can be written as a sum of positive squares in 4 ways, for example, as 14653584 + 37075921 = 3828^2 + 6089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51729505 - 2²³ = 43340897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12004 + ... + 15733.

It is an arithmetic number, because the mean of its divisors is an integer number (7780509).

Almost surely, 2^51729505 is an apocalyptic number.

It is an amenable number.

51729505 is a deficient number, since it is larger than the sum of its proper divisors (10514567).

51729505 is a wasteful number, since it uses less digits than its factorization.

51729505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28115.

The product of its (nonzero) digits is 15750, while the sum is 34.

The square root of 51729505 is about 7192.3226429298. The cubic root of 51729505 is about 372.6027943262.

The spelling of 51729505 in words is "fifty-one million, seven hundred twenty-nine thousand, five hundred five".