3694071721 has 2 divisors, whose sum is σ = 3694071722. Its totient is φ = 3694071720.

The previous prime is 3694071671. The next prime is 3694071727. The reversal of 3694071721 is 1271704963.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3676724496 + 17347225 = 60636^2 + 4165^2 .

It is a cyclic number.

It is not a de Polignac number, because 3694071721 - 2¹⁹ = 3693547433 is a prime.

It is not a weakly prime, because it can be changed into another prime (3694071727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1847035860 + 1847035861.

It is an arithmetic number, because the mean of its divisors is an integer number (1847035861).

Almost surely, 2^3694071721 is an apocalyptic number.

It is an amenable number.

3694071721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3694071721 is an equidigital number, since it uses as much as digits as its factorization.

3694071721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 3694071721 is about 60778.8756148055. The cubic root of 3694071721 is about 1545.8538824029.

The spelling of 3694071721 in words is "three billion, six hundred ninety-four million, seventy-one thousand, seven hundred twenty-one".