3851815969 has 9 divisors (see below), whose sum is σ = 3929218419. Its totient is φ = 3775912920.

The previous prime is 3851815939. The next prime is 3851815993. The reversal of 3851815969 is 9695181583.

The square root of 3851815969 is 62063.

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

It can be written as a sum of positive squares in only one way, i.e., 2776763025 + 1075052944 = 52695^2 + 32788^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3851815969 is a prime.

It is a super-2 number, since 2×3851815969² = 29672972518086817922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3851815939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3288754 + ... + 3289924.

Almost surely, 2^3851815969 is an apocalyptic number.

3851815969 is the 62063-rd square number.

3851815969 is the 31032-nd centered octagonal number.

It is an amenable number.

3851815969 is a deficient number, since it is larger than the sum of its proper divisors (77402450).

3851815969 is an frugal number, since it uses more digits than its factorization.

3851815969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448 (or 1224 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 55.

The cubic root of 3851815969 is about 1567.5515908157.

The spelling of 3851815969 in words is "three billion, eight hundred fifty-one million, eight hundred fifteen thousand, nine hundred sixty-nine".