509987369956 has 27 divisors (see below), whose sum is σ = 941972779881. Its totient is φ = 241560110304.

The previous prime is 509987369923. The next prime is 509987369989. The reversal of 509987369956 is 659963789905.

The square root of 509987369956 is 714134.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (509987369923) and next prime (509987369989).

It can be written as a sum of positive squares in only one way, i.e., 372209808100 + 137777561856 = 610090^2 + 371184^2 .

It is a super-2 number, since 2×509987369956² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (76).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 27127696 + ... + 27146488.

Almost surely, 2^509987369956 is an apocalyptic number.

509987369956 is the 714134-th square number.

It is an amenable number.

509987369956 is a deficient number, since it is larger than the sum of its proper divisors (431985409925).

509987369956 is an frugal number, since it uses more digits than its factorization.

509987369956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37628 (or 18814 counting only the distinct ones).

The product of its (nonzero) digits is 992023200, while the sum is 76.

The spelling of 509987369956 in words is "five hundred nine billion, nine hundred eighty-seven million, three hundred sixty-nine thousand, nine hundred fifty-six".