52751781 has 6 divisors (see below), whose sum is σ = 76197030. Its totient is φ = 35167848.

The previous prime is 52751761. The next prime is 52751807. The reversal of 52751781 is 18715725.

52751781 is a `hidden beast` number, since 527 + 51 + 7 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 52056225 + 695556 = 7215^2 + 834^2 .

It is not a de Polignac number, because 52751781 - 2¹⁰ = 52750757 is a prime.

It is a super-2 number, since 2×52751781² = 5565500797343922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52751701) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2930646 + ... + 2930663.

It is an arithmetic number, because the mean of its divisors is an integer number (12699505).

Almost surely, 2^52751781 is an apocalyptic number.

It is an amenable number.

52751781 is a deficient number, since it is larger than the sum of its proper divisors (23445249).

52751781 is a wasteful number, since it uses less digits than its factorization.

52751781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5861315 (or 5861312 counting only the distinct ones).

The product of its digits is 19600, while the sum is 36.

The square root of 52751781 is about 7263.0421312285. The cubic root of 52751781 is about 375.0412541281.

It can be divided in two parts, 5275 and 1781, that added together give a square (7056 = 84²).

The spelling of 52751781 in words is "fifty-two million, seven hundred fifty-one thousand, seven hundred eighty-one".