53409557 has 4 divisors (see below), whose sum is σ = 53426700. Its totient is φ = 53392416.

The previous prime is 53409553. The next prime is 53409571. The reversal of 53409557 is 75590435.

It is a happy number.

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 26275876 + 27133681 = 5126^2 + 5209^2 .

It is a cyclic number.

It is not a de Polignac number, because 53409557 - 2² = 53409553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53409557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53409553) 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, 2432 + ... + 10617.

It is an arithmetic number, because the mean of its divisors is an integer number (13356675).

Almost surely, 2^53409557 is an apocalyptic number.

It is an amenable number.

53409557 is a deficient number, since it is larger than the sum of its proper divisors (17143).

53409557 is a wasteful number, since it uses less digits than its factorization.

53409557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17142.

The product of its (nonzero) digits is 94500, while the sum is 38.

The square root of 53409557 is about 7308.1842478142. The cubic root of 53409557 is about 376.5936492325.

The spelling of 53409557 in words is "fifty-three million, four hundred nine thousand, five hundred fifty-seven".