51255547 has 4 divisors (see below), whose sum is σ = 58577776. Its totient is φ = 43933320.

The previous prime is 51255517. The next prime is 51255551. The reversal of 51255547 is 74555215.

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 51255547 - 2¹⁹ = 50731259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51255517) 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, 3661104 + ... + 3661117.

It is an arithmetic number, because the mean of its divisors is an integer number (14644444).

Almost surely, 2^51255547 is an apocalyptic number.

51255547 is a deficient number, since it is larger than the sum of its proper divisors (7322229).

51255547 is an equidigital number, since it uses as much as digits as its factorization.

51255547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7322228.

The product of its digits is 35000, while the sum is 34.

The square root of 51255547 is about 7159.2979404408. The cubic root of 51255547 is about 371.4613427058.

The spelling of 51255547 in words is "fifty-one million, two hundred fifty-five thousand, five hundred forty-seven".