4069036521 has 27 divisors (see below), whose sum is σ = 6463733367. Its totient is φ = 2464806960.

The previous prime is 4069036501. The next prime is 4069036541. The reversal of 4069036521 is 1256309604.

It is a happy number.

The square root of 4069036521 is 63789.

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

4069036521 is a `hidden beast` number, since 40 + 6 + 90 + 3 + 6 + 521 = 666.

It is an interprime number because it is at equal distance from previous prime (4069036501) and next prime (4069036541).

It can be written as a sum of positive squares in only one way, i.e., 2770443225 + 1298593296 = 52635^2 + 36036^2 .

It is not a de Polignac number, because 4069036521 - 2²¹ = 4066939369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4069036501) 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, 2104071 + ... + 2106003.

Almost surely, 2^4069036521 is an apocalyptic number.

4069036521 is the 63789-th square number.

4069036521 is the 31895-th centered octagonal number.

It is an amenable number.

4069036521 is a deficient number, since it is larger than the sum of its proper divisors (2394696846).

4069036521 is an equidigital number, since it uses as much as digits as its factorization.

4069036521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3894 (or 1947 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The cubic root of 4069036521 is about 1596.4813981614.

Multiplying 4069036521 by its sum of digits (36), we get a square (146485314756 = 382734²).

The spelling of 4069036521 in words is "four billion, sixty-nine million, thirty-six thousand, five hundred twenty-one".