51545243 has 4 divisors (see below), whose sum is σ = 51683808. Its totient is φ = 51406680.

The previous prime is 51545237. The next prime is 51545251. The reversal of 51545243 is 34254515.

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 51545243 - 2¹⁴ = 51528859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51545213) 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, 68723 + ... + 69468.

It is an arithmetic number, because the mean of its divisors is an integer number (12920952).

Almost surely, 2^51545243 is an apocalyptic number.

51545243 is a deficient number, since it is larger than the sum of its proper divisors (138565).

51545243 is a wasteful number, since it uses less digits than its factorization.

51545243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138564.

The product of its digits is 12000, while the sum is 29.

The square root of 51545243 is about 7179.5015843720. The cubic root of 51545243 is about 372.1598606680.

Adding to 51545243 its reverse (34254515), we get a palindrome (85799758).

The spelling of 51545243 in words is "fifty-one million, five hundred forty-five thousand, two hundred forty-three".