4155509 has 4 divisors (see below), whose sum is σ = 4374240. Its totient is φ = 3936780.

The previous prime is 4155469. The next prime is 4155511. The reversal of 4155509 is 9055514.

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 4155509 - 2¹⁶ = 4089973 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 (4155539) 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, 109337 + ... + 109374.

It is an arithmetic number, because the mean of its divisors is an integer number (1093560).

Almost surely, 2^4155509 is an apocalyptic number.

It is an amenable number.

4155509 is a deficient number, since it is larger than the sum of its proper divisors (218731).

4155509 is a wasteful number, since it uses less digits than its factorization.

4155509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218730.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 4155509 is about 2038.5065611864. The cubic root of 4155509 is about 160.7711342499.

It can be divided in two parts, 4155 and 509, that added together give a palindrome (4664).

The spelling of 4155509 in words is "four million, one hundred fifty-five thousand, five hundred nine".