3561728369 has 2 divisors, whose sum is σ = 3561728370. Its totient is φ = 3561728368.

The previous prime is 3561728323. The next prime is 3561728381. The reversal of 3561728369 is 9638271653.

3561728369 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2704000000 + 857728369 = 52000^2 + 29287^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3561728369 is a prime.

It is a super-2 number, since 2×3561728369² = 25371817949078800322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3561728389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1780864184 + 1780864185.

It is an arithmetic number, because the mean of its divisors is an integer number (1780864185).

Almost surely, 2^3561728369 is an apocalyptic number.

It is an amenable number.

3561728369 is a deficient number, since it is larger than the sum of its proper divisors (1).

3561728369 is an equidigital number, since it uses as much as digits as its factorization.

3561728369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The square root of 3561728369 is about 59680.2175683032. The cubic root of 3561728369 is about 1527.1684095179.

The spelling of 3561728369 in words is "three billion, five hundred sixty-one million, seven hundred twenty-eight thousand, three hundred sixty-nine".