51005731 has 8 divisors (see below), whose sum is σ = 58338144. Its totient is φ = 43684800.

The previous prime is 51005711. The next prime is 51005737. The reversal of 51005731 is 13750015.

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-51005731 is a prime.

It is a super-2 number, since 2×51005731² = 5203169189688722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51005737) 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, 11391 + ... + 15223.

It is an arithmetic number, because the mean of its divisors is an integer number (7292268).

Almost surely, 2^51005731 is an apocalyptic number.

51005731 is a deficient number, since it is larger than the sum of its proper divisors (7332413).

51005731 is a wasteful number, since it uses less digits than its factorization.

51005731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5741.

The product of its (nonzero) digits is 525, while the sum is 22.

The square root of 51005731 is about 7141.8296675292. The cubic root of 51005731 is about 370.8568672632.

Adding to 51005731 its reverse (13750015), we get a palindrome (64755746).

The spelling of 51005731 in words is "fifty-one million, five thousand, seven hundred thirty-one".