51111717 has 16 divisors (see below), whose sum is σ = 71662080. Its totient is φ = 32356800.

The previous prime is 51111703. The next prime is 51111719. The reversal of 51111717 is 71711115.

It is not a de Polignac number, because 51111717 - 2¹⁰ = 51110693 is a prime.

It is a super-2 number, since 2×51111717² = 5224815229376178, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111719) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 492 + ... + 10122.

It is an arithmetic number, because the mean of its divisors is an integer number (4478880).

Almost surely, 2^51111717 is an apocalyptic number.

It is an amenable number.

51111717 is a deficient number, since it is larger than the sum of its proper divisors (20550363).

51111717 is a wasteful number, since it uses less digits than its factorization.

51111717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9724.

The product of its digits is 245, while the sum is 24.

The square root of 51111717 is about 7149.2459042895. The cubic root of 51111717 is about 371.1135602651.

The spelling of 51111717 in words is "fifty-one million, one hundred eleven thousand, seven hundred seventeen".