51311729 has 8 divisors (see below), whose sum is σ = 62091648. Its totient is φ = 41394240.

The previous prime is 51311719. The next prime is 51311747. The reversal of 51311729 is 92711315.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51311729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51311719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215477 + ... + 215714.

It is an arithmetic number, because the mean of its divisors is an integer number (7761456).

Almost surely, 2^51311729 is an apocalyptic number.

It is an amenable number.

51311729 is a deficient number, since it is larger than the sum of its proper divisors (10779919).

51311729 is a wasteful number, since it uses less digits than its factorization.

51311729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431215.

The product of its digits is 1890, while the sum is 29.

The square root of 51311729 is about 7163.2205745740. The cubic root of 51311729 is about 371.5970146601.

The spelling of 51311729 in words is "fifty-one million, three hundred eleven thousand, seven hundred twenty-nine".