52781 has 4 divisors (see below), whose sum is σ = 53952. Its totient is φ = 51612.

The previous prime is 52769. The next prime is 52783. The reversal of 52781 is 18725.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52781 is a prime.

It is a super-2 number, since 2×52781² = 5571667922, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

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 (52783) 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, 515 + ... + 608.

It is an arithmetic number, because the mean of its divisors is an integer number (13488).

2⁵²⁷⁸¹ is an apocalyptic number.

It is an amenable number.

52781 is a deficient number, since it is larger than the sum of its proper divisors (1171).

52781 is a wasteful number, since it uses less digits than its factorization.

52781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1170.

The product of its digits is 560, while the sum is 23.

The square root of 52781 is about 229.7411586982. The cubic root of 52781 is about 37.5110485963.

The spelling of 52781 in words is "fifty-two thousand, seven hundred eighty-one".