3621739921 has 2 divisors, whose sum is σ = 3621739922. Its totient is φ = 3621739920.

The previous prime is 3621739909. The next prime is 3621739981. The reversal of 3621739921 is 1299371263.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1992729600 + 1629010321 = 44640^2 + 40361^2 .

It is a cyclic number.

It is not a de Polignac number, because 3621739921 - 2⁹ = 3621739409 is a prime.

It is not a weakly prime, because it can be changed into another prime (3621739981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1810869960 + 1810869961.

It is an arithmetic number, because the mean of its divisors is an integer number (1810869961).

Almost surely, 2^3621739921 is an apocalyptic number.

It is an amenable number.

3621739921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3621739921 is an equidigital number, since it uses as much as digits as its factorization.

3621739921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 43.

The square root of 3621739921 is about 60180.8933217180. The cubic root of 3621739921 is about 1535.6977691816.

The spelling of 3621739921 in words is "three billion, six hundred twenty-one million, seven hundred thirty-nine thousand, nine hundred twenty-one".