55071217 has 4 divisors (see below), whose sum is σ = 55096816. Its totient is φ = 55045620.

The previous prime is 55071209. The next prime is 55071229. The reversal of 55071217 is 71217055.

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 55071217 - 2³ = 55071209 is a prime.

It is a super-2 number, since 2×55071217² = 6065677883722178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55071257) 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, 9243 + ... + 13984.

It is an arithmetic number, because the mean of its divisors is an integer number (13774204).

Almost surely, 2^55071217 is an apocalyptic number.

It is an amenable number.

55071217 is a deficient number, since it is larger than the sum of its proper divisors (25599).

55071217 is a wasteful number, since it uses less digits than its factorization.

55071217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25598.

The product of its (nonzero) digits is 2450, while the sum is 28.

The square root of 55071217 is about 7420.9983829671. The cubic root of 55071217 is about 380.4593176229.

It can be divided in two parts, 5507 and 1217, that added together give a square (6724 = 82²).

The spelling of 55071217 in words is "fifty-five million, seventy-one thousand, two hundred seventeen".