51550317 has 32 divisors (see below), whose sum is σ = 93999360. Its totient is φ = 27190080.

The previous prime is 51550309. The next prime is 51550319. The reversal of 51550317 is 71305515.

It is not a de Polignac number, because 51550317 - 2³ = 51550309 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51550319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8034 + ... + 12947.

It is an arithmetic number, because the mean of its divisors is an integer number (2937480).

Almost surely, 2^51550317 is an apocalyptic number.

It is an amenable number.

51550317 is a deficient number, since it is larger than the sum of its proper divisors (42449043).

51550317 is a wasteful number, since it uses less digits than its factorization.

51550317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21010 (or 21004 counting only the distinct ones).

The product of its (nonzero) digits is 2625, while the sum is 27.

The square root of 51550317 is about 7179.8549428244. The cubic root of 51550317 is about 372.1720717992.

The spelling of 51550317 in words is "fifty-one million, five hundred fifty thousand, three hundred seventeen".