53518557 has 4 divisors (see below), whose sum is σ = 71358080. Its totient is φ = 35679036.

The previous prime is 53518547. The next prime is 53518561. The reversal of 53518557 is 75581535.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 53518557 - 2⁴ = 53518541 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 (53518537) 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, 8919757 + ... + 8919762.

It is an arithmetic number, because the mean of its divisors is an integer number (17839520).

Almost surely, 2^53518557 is an apocalyptic number.

It is an amenable number.

53518557 is a deficient number, since it is larger than the sum of its proper divisors (17839523).

53518557 is a wasteful number, since it uses less digits than its factorization.

53518557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17839522.

The product of its digits is 105000, while the sum is 39.

The square root of 53518557 is about 7315.6378395872. The cubic root of 53518557 is about 376.8496634315.

The spelling of 53518557 in words is "fifty-three million, five hundred eighteen thousand, five hundred fifty-seven".