51243531 has 8 divisors (see below), whose sum is σ = 68368080. Its totient is φ = 34140672.

The previous prime is 51243529. The next prime is 51243541. The reversal of 51243531 is 13534215.

51243531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51243531 - 2¹ = 51243529 is a prime.

It is a super-2 number, since 2×51243531² = 5251798938695922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51243541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1275 + ... + 10203.

It is an arithmetic number, because the mean of its divisors is an integer number (8546010).

Almost surely, 2^51243531 is an apocalyptic number.

51243531 is a deficient number, since it is larger than the sum of its proper divisors (17124549).

51243531 is a wasteful number, since it uses less digits than its factorization.

51243531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10845.

The product of its digits is 1800, while the sum is 24.

The square root of 51243531 is about 7158.4587028214. The cubic root of 51243531 is about 371.4323128180.

Adding to 51243531 its reverse (13534215), we get a palindrome (64777746).

The spelling of 51243531 in words is "fifty-one million, two hundred forty-three thousand, five hundred thirty-one".