51511717 has 16 divisors (see below), whose sum is σ = 58017600. Its totient is φ = 45446400.

The previous prime is 51511693. The next prime is 51511741. The reversal of 51511717 is 71711515.

It is an interprime number because it is at equal distance from previous prime (51511693) and next prime (51511741).

It is a cyclic number.

It is not a de Polignac number, because 51511717 - 2¹⁵ = 51478949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51511777) 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, 31834 + ... + 33412.

It is an arithmetic number, because the mean of its divisors is an integer number (3626100).

Almost surely, 2^51511717 is an apocalyptic number.

It is an amenable number.

51511717 is a deficient number, since it is larger than the sum of its proper divisors (6505883).

51511717 is a wasteful number, since it uses less digits than its factorization.

51511717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716.

The product of its digits is 1225, while the sum is 28.

The square root of 51511717 is about 7177.1663628482. The cubic root of 51511717 is about 372.0791565665.

The spelling of 51511717 in words is "fifty-one million, five hundred eleven thousand, seven hundred seventeen".