55217291 has 6 divisors (see below), whose sum is σ = 55852692. Its totient is φ = 54589040.

The previous prime is 55217251. The next prime is 55217303. The reversal of 55217291 is 19271255.

It is a happy number.

It is not a de Polignac number, because 55217291 - 2¹⁰ = 55216267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55217251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4436 + ... + 11406.

It is an arithmetic number, because the mean of its divisors is an integer number (9308782).

Almost surely, 2^55217291 is an apocalyptic number.

55217291 is a deficient number, since it is larger than the sum of its proper divisors (635401).

55217291 is an frugal number, since it uses more digits than its factorization.

55217291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7149 (or 7060 counting only the distinct ones).

The product of its digits is 6300, while the sum is 32.

The square root of 55217291 is about 7430.8338024747. The cubic root of 55217291 is about 380.7954045586.

The spelling of 55217291 in words is "fifty-five million, two hundred seventeen thousand, two hundred ninety-one".