52815557 has 2 divisors, whose sum is σ = 52815558. Its totient is φ = 52815556.

The previous prime is 52815533. The next prime is 52815559. The reversal of 52815557 is 75551825.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51179716 + 1635841 = 7154^2 + 1279^2 .

It is a cyclic number.

It is not a de Polignac number, because 52815557 - 2⁶ = 52815493 is a prime.

It is a super-2 number, since 2×52815557² = 5578966122440498, which contains 22 as substring.

Together with 52815559, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 52815557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52815559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26407778 + 26407779.

It is an arithmetic number, because the mean of its divisors is an integer number (26407779).

Almost surely, 2^52815557 is an apocalyptic number.

It is an amenable number.

52815557 is a deficient number, since it is larger than the sum of its proper divisors (1).

52815557 is an equidigital number, since it uses as much as digits as its factorization.

52815557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70000, while the sum is 38.

The square root of 52815557 is about 7267.4312518248. The cubic root of 52815557 is about 375.1923327455.

The spelling of 52815557 in words is "fifty-two million, eight hundred fifteen thousand, five hundred fifty-seven".