52125781 has 8 divisors (see below), whose sum is σ = 53186328. Its totient is φ = 51072000.

The previous prime is 52125779. The next prime is 52125793. The reversal of 52125781 is 18752125.

It can be written as a sum of positive squares in 4 ways, for example, as 12006225 + 40119556 = 3465^2 + 6334^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 52125781 - 2¹ = 52125779 is a prime.

It is a super-2 number, since 2×52125781² = 5434194089719922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52155781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15621 + ... + 18661.

It is an arithmetic number, because the mean of its divisors is an integer number (6648291).

Almost surely, 2^52125781 is an apocalyptic number.

It is an amenable number.

52125781 is a deficient number, since it is larger than the sum of its proper divisors (1060547).

52125781 is a wasteful number, since it uses less digits than its factorization.

52125781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383.

The product of its digits is 5600, while the sum is 31.

The square root of 52125781 is about 7219.8186265307. The cubic root of 52125781 is about 373.5518214242.

The spelling of 52125781 in words is "fifty-two million, one hundred twenty-five thousand, seven hundred eighty-one".