51347531 has 4 divisors (see below), whose sum is σ = 54367992. Its totient is φ = 48327072.

The previous prime is 51347509. The next prime is 51347533. The reversal of 51347531 is 13574315.

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 51347531 - 2⁶ = 51347467 is a prime.

It is a super-2 number, since 2×51347531² = 5273137879591922, 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 = 51347494 and 51347503.

It is not an unprimeable number, because it can be changed into a prime (51347533) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1510205 + ... + 1510238.

It is an arithmetic number, because the mean of its divisors is an integer number (13591998).

Almost surely, 2^51347531 is an apocalyptic number.

51347531 is a deficient number, since it is larger than the sum of its proper divisors (3020461).

51347531 is a wasteful number, since it uses less digits than its factorization.

51347531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3020460.

The product of its digits is 6300, while the sum is 29.

The square root of 51347531 is about 7165.7191544185. The cubic root of 51347531 is about 371.6834200076.

The spelling of 51347531 in words is "fifty-one million, three hundred forty-seven thousand, five hundred thirty-one".