1012555509 has 16 divisors (see below), whose sum is σ = 1543616640. Its totient is φ = 578350080.

The previous prime is 1012555499. The next prime is 1012555541. The reversal of 1012555509 is 9055552101.

It is not a de Polignac number, because 1012555509 - 2¹¹ = 1012553461 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1012555509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012555559) 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 15 ways as a sum of consecutive naturals, for example, 45549 + ... + 64029.

It is an arithmetic number, because the mean of its divisors is an integer number (96476040).

Almost surely, 2^1012555509 is an apocalyptic number.

It is an amenable number.

1012555509 is a deficient number, since it is larger than the sum of its proper divisors (531061131).

1012555509 is a wasteful number, since it uses less digits than its factorization.

1012555509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21100.

The product of its (nonzero) digits is 11250, while the sum is 33.

The square root of 1012555509 is about 31820.6773812249. The cubic root of 1012555509 is about 1004.1677751848.

The spelling of 1012555509 in words is "one billion, twelve million, five hundred fifty-five thousand, five hundred nine".