55487521 has 4 divisors (see below), whose sum is σ = 55692544. Its totient is φ = 55282500.

The previous prime is 55487513. The next prime is 55487533. The reversal of 55487521 is 12578455.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12578455 = 5 ⋅2515691.

It is a cyclic number.

It is not a de Polignac number, because 55487521 - 2³ = 55487513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55487561) 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, 102105 + ... + 102646.

It is an arithmetic number, because the mean of its divisors is an integer number (13923136).

Almost surely, 2^55487521 is an apocalyptic number.

It is an amenable number.

55487521 is a deficient number, since it is larger than the sum of its proper divisors (205023).

55487521 is a wasteful number, since it uses less digits than its factorization.

55487521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205022.

The product of its digits is 56000, while the sum is 37.

The square root of 55487521 is about 7448.9946301498. The cubic root of 55487521 is about 381.4155903092.

The spelling of 55487521 in words is "fifty-five million, four hundred eighty-seven thousand, five hundred twenty-one".