55538517 has 16 divisors (see below), whose sum is σ = 76279680. Its totient is φ = 35917632.

The previous prime is 55538503. The next prime is 55538521. The reversal of 55538517 is 71583555.

It is a de Polignac number, because none of the positive numbers 2^k-55538517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55538597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56008 + ... + 56990.

It is an arithmetic number, because the mean of its divisors is an integer number (4767480).

Almost surely, 2^55538517 is an apocalyptic number.

It is an amenable number.

55538517 is a deficient number, since it is larger than the sum of its proper divisors (20741163).

55538517 is a wasteful number, since it uses less digits than its factorization.

55538517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532.

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

The square root of 55538517 is about 7452.4168562957. The cubic root of 55538517 is about 381.5324016414.

The spelling of 55538517 in words is "fifty-five million, five hundred thirty-eight thousand, five hundred seventeen".