1516868809 has 27 divisors (see below), whose sum is σ = 1690216437. Its totient is φ = 1360963968.

The previous prime is 1516868797. The next prime is 1516868833. The reversal of 1516868809 is 9088686151.

The square root of 1516868809 is 38947.

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

It can be written as a sum of positive squares in 4 ways, for example, as 149940025 + 1366928784 = 12245^2 + 36972^2 .

It is not a de Polignac number, because 1516868809 - 2⁵ = 1516868777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1516868869) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 19200832 + ... + 19200910.

Almost surely, 2^1516868809 is an apocalyptic number.

1516868809 is the 38947-th square number.

1516868809 is the 19474-th centered octagonal number.

It is an amenable number.

1516868809 is a deficient number, since it is larger than the sum of its proper divisors (173347628).

1516868809 is an frugal number, since it uses more digits than its factorization.

1516868809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 52.

The cubic root of 1516868809 is about 1148.9893601075.

The spelling of 1516868809 in words is "one billion, five hundred sixteen million, eight hundred sixty-eight thousand, eight hundred nine".