509920955 has 16 divisors (see below), whose sum is σ = 644666880. Its totient is φ = 386132832.

The previous prime is 509920951. The next prime is 509920963. The reversal of 509920955 is 559029905.

It is a cyclic number.

It is not a de Polignac number, because 509920955 - 2² = 509920951 is a prime.

It is a super-2 number, since 2×509920955² = 520038760696224050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (509920951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 216092 + ... + 218438.

It is an arithmetic number, because the mean of its divisors is an integer number (40291680).

Almost surely, 2^509920955 is an apocalyptic number.

509920955 is a deficient number, since it is larger than the sum of its proper divisors (134745925).

509920955 is a wasteful number, since it uses less digits than its factorization.

509920955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4658.

The product of its (nonzero) digits is 182250, while the sum is 44.

The square root of 509920955 is about 22581.4294277400. The cubic root of 509920955 is about 798.9156950800.

The spelling of 509920955 in words is "five hundred nine million, nine hundred twenty thousand, nine hundred fifty-five".