55551517 has 4 divisors (see below), whose sum is σ = 63487456. Its totient is φ = 47615580.

The previous prime is 55551493. The next prime is 55551547. The reversal of 55551517 is 71515555.

It is a happy number.

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 55551517 - 2⁷ = 55551389 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 (55551547) 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, 3967959 + ... + 3967972.

It is an arithmetic number, because the mean of its divisors is an integer number (15871864).

Almost surely, 2^55551517 is an apocalyptic number.

It is an amenable number.

55551517 is a deficient number, since it is larger than the sum of its proper divisors (7935939).

55551517 is an equidigital number, since it uses as much as digits as its factorization.

55551517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7935938.

The product of its digits is 21875, while the sum is 34.

The square root of 55551517 is about 7453.2890055331. The cubic root of 55551517 is about 381.5621679763.

The spelling of 55551517 in words is "fifty-five million, five hundred fifty-one thousand, five hundred seventeen".