509490155 has 4 divisors (see below), whose sum is σ = 611388192. Its totient is φ = 407592120.

The previous prime is 509490151. The next prime is 509490161. The reversal of 509490155 is 551094905.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 509490155 - 2² = 509490151 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509490151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50949011 + ... + 50949020.

It is an arithmetic number, because the mean of its divisors is an integer number (152847048).

Almost surely, 2^509490155 is an apocalyptic number.

509490155 is a deficient number, since it is larger than the sum of its proper divisors (101898037).

509490155 is a wasteful number, since it uses less digits than its factorization.

509490155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101898036.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 509490155 is about 22571.8886006466. Note that the first 3 decimals coincide. The cubic root of 509490155 is about 798.6906472258.

The spelling of 509490155 in words is "five hundred nine million, four hundred ninety thousand, one hundred fifty-five".