55191317 has 8 divisors (see below), whose sum is σ = 57320736. Its totient is φ = 53100432.

The previous prime is 55191313. The next prime is 55191319. The reversal of 55191317 is 71319155.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55191317 - 2² = 55191313 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 (55191313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6698 + ... + 12459.

It is an arithmetic number, because the mean of its divisors is an integer number (7165092).

Almost surely, 2^55191317 is an apocalyptic number.

It is an amenable number.

55191317 is a deficient number, since it is larger than the sum of its proper divisors (2129419).

55191317 is a wasteful number, since it uses less digits than its factorization.

55191317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19267.

The product of its digits is 4725, while the sum is 32.

The square root of 55191317 is about 7429.0858791644. The cubic root of 55191317 is about 380.7356869658.

The spelling of 55191317 in words is "fifty-five million, one hundred ninety-one thousand, three hundred seventeen".