53117765 has 4 divisors (see below), whose sum is σ = 63741324. Its totient is φ = 42494208.

The previous prime is 53117761. The next prime is 53117767. The reversal of 53117765 is 56771135.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5769604 + 47348161 = 2402^2 + 6881^2 .

It is a cyclic number.

It is not a de Polignac number, because 53117765 - 2² = 53117761 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53117761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5311772 + ... + 5311781.

It is an arithmetic number, because the mean of its divisors is an integer number (15935331).

Almost surely, 2^53117765 is an apocalyptic number.

It is an amenable number.

53117765 is a deficient number, since it is larger than the sum of its proper divisors (10623559).

53117765 is a wasteful number, since it uses less digits than its factorization.

53117765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10623558.

The product of its digits is 22050, while the sum is 35.

The square root of 53117765 is about 7288.1935347519. The cubic root of 53117765 is about 375.9065828170.

The spelling of 53117765 in words is "fifty-three million, one hundred seventeen thousand, seven hundred sixty-five".