51317697 has 4 divisors (see below), whose sum is σ = 68423600. Its totient is φ = 34211796.

The previous prime is 51317687. The next prime is 51317699. The reversal of 51317697 is 79671315.

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 not a de Polignac number, because 51317697 - 2⁴ = 51317681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51317699) 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, 8552947 + ... + 8552952.

It is an arithmetic number, because the mean of its divisors is an integer number (17105900).

Almost surely, 2^51317697 is an apocalyptic number.

It is an amenable number.

51317697 is a deficient number, since it is larger than the sum of its proper divisors (17105903).

51317697 is a wasteful number, since it uses less digits than its factorization.

51317697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17105902.

The product of its digits is 39690, while the sum is 39.

The square root of 51317697 is about 7163.6371348638. The cubic root of 51317697 is about 371.6114207557.

The spelling of 51317697 in words is "fifty-one million, three hundred seventeen thousand, six hundred ninety-seven".