51547249 has 8 divisors (see below), whose sum is σ = 55746152. Its totient is φ = 47381760.

The previous prime is 51547241. The next prime is 51547259. The reversal of 51547249 is 94274515.

It can be written as a sum of positive squares in 4 ways, for example, as 15547249 + 36000000 = 3943^2 + 6000^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 51547249 - 2³ = 51547241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51547241) 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 7 ways as a sum of consecutive naturals, for example, 5094 + ... + 11359.

It is an arithmetic number, because the mean of its divisors is an integer number (6968269).

Almost surely, 2^51547249 is an apocalyptic number.

It is an amenable number.

51547249 is a deficient number, since it is larger than the sum of its proper divisors (4198903).

51547249 is a wasteful number, since it uses less digits than its factorization.

51547249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16707.

The product of its digits is 50400, while the sum is 37.

The square root of 51547249 is about 7179.6412863039. The cubic root of 51547249 is about 372.1646884203.

It can be divided in two parts, 5154 and 7249, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 51547249 in words is "fifty-one million, five hundred forty-seven thousand, two hundred forty-nine".