51917385 has 32 divisors (see below), whose sum is σ = 89808768. Its totient is φ = 25459200.

The previous prime is 51917353. The next prime is 51917389. The reversal of 51917385 is 58371915.

It is not a de Polignac number, because 51917385 - 2⁵ = 51917353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (51917389) 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, 86085 + ... + 86685.

It is an arithmetic number, because the mean of its divisors is an integer number (2806524).

Almost surely, 2^51917385 is an apocalyptic number.

It is an amenable number.

51917385 is a deficient number, since it is larger than the sum of its proper divisors (37891383).

51917385 is a wasteful number, since it uses less digits than its factorization.

51917385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065.

The product of its digits is 37800, while the sum is 39.

The square root of 51917385 is about 7205.3719543130. The cubic root of 51917385 is about 373.0533433378.

The spelling of 51917385 in words is "fifty-one million, nine hundred seventeen thousand, three hundred eighty-five".