51478517 has 4 divisors (see below), whose sum is σ = 51498816. Its totient is φ = 51458220.

The previous prime is 51478501. The next prime is 51478519. The reversal of 51478517 is 71587415.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51478517 - 2⁴ = 51478501 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 (51478519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5693 + ... + 11634.

It is an arithmetic number, because the mean of its divisors is an integer number (12874704).

Almost surely, 2^51478517 is an apocalyptic number.

It is an amenable number.

51478517 is a deficient number, since it is larger than the sum of its proper divisors (20299).

51478517 is a wasteful number, since it uses less digits than its factorization.

51478517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20298.

The product of its digits is 39200, while the sum is 38.

The square root of 51478517 is about 7174.8530995415. The cubic root of 51478517 is about 371.9992027000. Note that the first 3 decimals are identical.

The spelling of 51478517 in words is "fifty-one million, four hundred seventy-eight thousand, five hundred seventeen".