52181557 has 4 divisors (see below), whose sum is σ = 52446636. Its totient is φ = 51916480.

The previous prime is 52181531. The next prime is 52181593. The reversal of 52181557 is 75518125.

52181557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 43573201 + 8608356 = 6601^2 + 2934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52181557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52181957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132244 + ... + 132637.

It is an arithmetic number, because the mean of its divisors is an integer number (13111659).

Almost surely, 2^52181557 is an apocalyptic number.

It is an amenable number.

52181557 is a deficient number, since it is larger than the sum of its proper divisors (265079).

52181557 is a wasteful number, since it uses less digits than its factorization.

52181557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265078.

The product of its digits is 14000, while the sum is 34.

The square root of 52181557 is about 7223.6802946974. The cubic root of 52181557 is about 373.6850107915.

The spelling of 52181557 in words is "fifty-two million, one hundred eighty-one thousand, five hundred fifty-seven".