3523725721 has 2 divisors, whose sum is σ = 3523725722. Its totient is φ = 3523725720.

The previous prime is 3523725719. The next prime is 3523725727. The reversal of 3523725721 is 1275273253.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3331598400 + 192127321 = 57720^2 + 13861^2 .

It is a cyclic number.

It is not a de Polignac number, because 3523725721 - 2¹ = 3523725719 is a prime.

Together with 3523725719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3523725727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1761862860 + 1761862861.

It is an arithmetic number, because the mean of its divisors is an integer number (1761862861).

Almost surely, 2^3523725721 is an apocalyptic number.

It is an amenable number.

3523725721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3523725721 is an equidigital number, since it uses as much as digits as its factorization.

3523725721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 37.

The square root of 3523725721 is about 59360.9781000954. The cubic root of 3523725721 is about 1521.7174897533.

Adding to 3523725721 its reverse (1275273253), we get a palindrome (4798998974).

The spelling of 3523725721 in words is "three billion, five hundred twenty-three million, seven hundred twenty-five thousand, seven hundred twenty-one".