51730031 has 4 divisors (see below), whose sum is σ = 54772992. Its totient is φ = 48687072.

The previous prime is 51730001. The next prime is 51730037. The reversal of 51730031 is 13003715.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51730031 - 2¹⁴ = 51713647 is a prime.

It is a super-2 number, since 2×51730031² = 5351992214521922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51729985 and 51730012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51730037) 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, 1521455 + ... + 1521488.

It is an arithmetic number, because the mean of its divisors is an integer number (13693248).

Almost surely, 2^51730031 is an apocalyptic number.

51730031 is a deficient number, since it is larger than the sum of its proper divisors (3042961).

51730031 is a wasteful number, since it uses less digits than its factorization.

51730031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042960.

The product of its (nonzero) digits is 315, while the sum is 20.

The square root of 51730031 is about 7192.3592096057. The cubic root of 51730031 is about 372.6040572315.

Adding to 51730031 its reverse (13003715), we get a palindrome (64733746).

The spelling of 51730031 in words is "fifty-one million, seven hundred thirty thousand, thirty-one".