55175509 has 4 divisors (see below), whose sum is σ = 56349504. Its totient is φ = 54001516.

The previous prime is 55175503. The next prime is 55175539. The reversal of 55175509 is 90557155.

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 55175509 - 2²⁵ = 21621077 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 (55175503) 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, 586927 + ... + 587020.

It is an arithmetic number, because the mean of its divisors is an integer number (14087376).

Almost surely, 2^55175509 is an apocalyptic number.

It is an amenable number.

55175509 is a deficient number, since it is larger than the sum of its proper divisors (1173995).

55175509 is a wasteful number, since it uses less digits than its factorization.

55175509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173994.

The product of its (nonzero) digits is 39375, while the sum is 37.

The square root of 55175509 is about 7428.0218766506. The cubic root of 55175509 is about 380.6993331527.

It can be divided in two parts, 5517 and 5509, that added together give a triangular number (11026 = T₁₄₈).

The spelling of 55175509 in words is "fifty-five million, one hundred seventy-five thousand, five hundred nine".