2815681969 has 9 divisors (see below), whose sum is σ = 2879415147. Its totient is φ = 2753332944.

The previous prime is 2815681937. The next prime is 2815681987. The reversal of 2815681969 is 9691865182.

The square root of 2815681969 is 53063.

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., 239104369 + 2576577600 = 15463^2 + 50760^2 .

It is not a de Polignac number, because 2815681969 - 2⁵ = 2815681937 is a prime.

It is a super-2 number, since 2×2815681969² = 15856129901103433922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2815681909) 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 8 ways as a sum of consecutive naturals, for example, 2493397 + ... + 2494525.

Almost surely, 2^2815681969 is an apocalyptic number.

2815681969 is the 53063-rd square number.

2815681969 is the 26532-nd centered octagonal number.

It is an amenable number.

2815681969 is a deficient number, since it is larger than the sum of its proper divisors (63733178).

2815681969 is an frugal number, since it uses more digits than its factorization.

2815681969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352 (or 1176 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 55.

The cubic root of 2815681969 is about 1412.0861711342.

The spelling of 2815681969 in words is "two billion, eight hundred fifteen million, six hundred eighty-one thousand, nine hundred sixty-nine".