55539917 has 4 divisors (see below), whose sum is σ = 57954720. Its totient is φ = 53125116.

The previous prime is 55539889. The next prime is 55539929. The reversal of 55539917 is 71993555.

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 a cyclic number.

It is not a de Polignac number, because 55539917 - 2¹⁰ = 55538893 is a prime.

It is a super-3 number, since 3×55539917³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55539217) 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, 1207367 + ... + 1207412.

It is an arithmetic number, because the mean of its divisors is an integer number (14488680).

Almost surely, 2^55539917 is an apocalyptic number.

It is an amenable number.

55539917 is a deficient number, since it is larger than the sum of its proper divisors (2414803).

55539917 is a wasteful number, since it uses less digits than its factorization.

55539917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2414802.

The product of its digits is 212625, while the sum is 44.

The square root of 55539917 is about 7452.5107849637. The cubic root of 55539917 is about 381.5356074699.

The spelling of 55539917 in words is "fifty-five million, five hundred thirty-nine thousand, nine hundred seventeen".