3547695721 has 2 divisors, whose sum is σ = 3547695722. Its totient is φ = 3547695720.

The previous prime is 3547695659. The next prime is 3547695731. The reversal of 3547695721 is 1275967453.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3052010025 + 495685696 = 55245^2 + 22264^2 .

It is a cyclic number.

It is not a de Polignac number, because 3547695721 - 2⁹ = 3547695209 is a prime.

It is a super-2 number, since 2×3547695721² = 25172289857603419682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3547695731) 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, 1773847860 + 1773847861.

It is an arithmetic number, because the mean of its divisors is an integer number (1773847861).

Almost surely, 2^3547695721 is an apocalyptic number.

It is an amenable number.

3547695721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3547695721 is an equidigital number, since it uses as much as digits as its factorization.

3547695721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1587600, while the sum is 49.

The square root of 3547695721 is about 59562.5362203458. The cubic root of 3547695721 is about 1525.1601689336.

The spelling of 3547695721 in words is "three billion, five hundred forty-seven million, six hundred ninety-five thousand, seven hundred twenty-one".