51557447 has 8 divisors (see below), whose sum is σ = 56473200. Its totient is φ = 46850944.

The previous prime is 51557423. The next prime is 51557501. The reversal of 51557447 is 74475515.

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 51557447 - 2²⁴ = 34780231 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51557447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51557417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51797 + ... + 52782.

It is an arithmetic number, because the mean of its divisors is an integer number (7059150).

Almost surely, 2^51557447 is an apocalyptic number.

51557447 is a deficient number, since it is larger than the sum of its proper divisors (4915753).

51557447 is a wasteful number, since it uses less digits than its factorization.

51557447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104625.

The product of its digits is 98000, while the sum is 38.

The square root of 51557447 is about 7180.3514537939. The cubic root of 51557447 is about 372.1892295634.

The spelling of 51557447 in words is "fifty-one million, five hundred fifty-seven thousand, four hundred forty-seven".