51717361 has 4 divisors (see below), whose sum is σ = 52425892. Its totient is φ = 51008832.

The previous prime is 51717329. The next prime is 51717377. The reversal of 51717361 is 16371715.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16371715 = 5 ⋅3274343.

It can be written as a sum of positive squares in 2 ways, for example, as 23425600 + 28291761 = 4840^2 + 5319^2 .

It is a cyclic number.

It is not a de Polignac number, because 51717361 - 2⁵ = 51717329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51717461) 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, 354156 + ... + 354301.

It is an arithmetic number, because the mean of its divisors is an integer number (13106473).

Almost surely, 2^51717361 is an apocalyptic number.

It is an amenable number.

51717361 is a deficient number, since it is larger than the sum of its proper divisors (708531).

51717361 is an equidigital number, since it uses as much as digits as its factorization.

51717361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708530.

The product of its digits is 4410, while the sum is 31.

The square root of 51717361 is about 7191.4783598367. The cubic root of 51717361 is about 372.5736346782.

The spelling of 51717361 in words is "fifty-one million, seven hundred seventeen thousand, three hundred sixty-one".