51477647 has 4 divisors (see below), whose sum is σ = 55437480. Its totient is φ = 47517816.

The previous prime is 51477617. The next prime is 51477691. The reversal of 51477647 is 74677415.

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 51477647 - 2¹² = 51473551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51477607) 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, 1979897 + ... + 1979922.

It is an arithmetic number, because the mean of its divisors is an integer number (13859370).

Almost surely, 2^51477647 is an apocalyptic number.

51477647 is a deficient number, since it is larger than the sum of its proper divisors (3959833).

51477647 is a wasteful number, since it uses less digits than its factorization.

51477647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3959832.

The product of its digits is 164640, while the sum is 41.

The square root of 51477647 is about 7174.7924708663. The cubic root of 51477647 is about 371.9971070612.

The spelling of 51477647 in words is "fifty-one million, four hundred seventy-seven thousand, six hundred forty-seven".