3521684729 has 2 divisors, whose sum is σ = 3521684730. Its totient is φ = 3521684728.

The previous prime is 3521684717. The next prime is 3521684743. The reversal of 3521684729 is 9274861253.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2494802704 + 1026882025 = 49948^2 + 32045^2 .

It is a cyclic number.

It is not a de Polignac number, because 3521684729 - 2¹² = 3521680633 is a prime.

It is not a weakly prime, because it can be changed into another prime (3521684329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1760842364 + 1760842365.

It is an arithmetic number, because the mean of its divisors is an integer number (1760842365).

Almost surely, 2^3521684729 is an apocalyptic number.

It is an amenable number.

3521684729 is a deficient number, since it is larger than the sum of its proper divisors (1).

3521684729 is an equidigital number, since it uses as much as digits as its factorization.

3521684729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 725760, while the sum is 47.

The square root of 3521684729 is about 59343.7842490686. The cubic root of 3521684729 is about 1521.4236328808.

The spelling of 3521684729 in words is "three billion, five hundred twenty-one million, six hundred eighty-four thousand, seven hundred twenty-nine".