51443131 has 4 divisors (see below), whose sum is σ = 51478264. Its totient is φ = 51408000.

The previous prime is 51443123. The next prime is 51443143. The reversal of 51443131 is 13134415.

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 51443131 - 2³ = 51443123 is a prime.

It is a super-2 number, since 2×51443131² = 5292791454166322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51443101) 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, 15270 + ... + 18331.

It is an arithmetic number, because the mean of its divisors is an integer number (12869566).

Almost surely, 2^51443131 is an apocalyptic number.

51443131 is a deficient number, since it is larger than the sum of its proper divisors (35133).

51443131 is a wasteful number, since it uses less digits than its factorization.

51443131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35132.

The product of its digits is 720, while the sum is 22.

The square root of 51443131 is about 7172.3867017890. The cubic root of 51443131 is about 371.9139465459.

Adding to 51443131 its reverse (13134415), we get a palindrome (64577546).

The spelling of 51443131 in words is "fifty-one million, four hundred forty-three thousand, one hundred thirty-one".