51543145 has 4 divisors (see below), whose sum is σ = 61851780. Its totient is φ = 41234512.

The previous prime is 51543131. The next prime is 51543203. The reversal of 51543145 is 54134515.

51543145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7080921 + 44462224 = 2661^2 + 6668^2 .

It is a cyclic number.

It is not a de Polignac number, because 51543145 - 2⁷ = 51543017 is a prime.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5154310 + ... + 5154319.

It is an arithmetic number, because the mean of its divisors is an integer number (15462945).

Almost surely, 2^51543145 is an apocalyptic number.

It is an amenable number.

51543145 is a deficient number, since it is larger than the sum of its proper divisors (10308635).

51543145 is a wasteful number, since it uses less digits than its factorization.

51543145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10308634.

The product of its digits is 6000, while the sum is 28.

The square root of 51543145 is about 7179.3554724641. The cubic root of 51543145 is about 372.1548113694.

It can be divided in two parts, 515 and 43145, that added together give a triangular number (43660 = T₂₉₅).

The spelling of 51543145 in words is "fifty-one million, five hundred forty-three thousand, one hundred forty-five".