3633481921 has 2 divisors, whose sum is σ = 3633481922. Its totient is φ = 3633481920.

The previous prime is 3633481903. The next prime is 3633481931. The reversal of 3633481921 is 1291843363.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3627050625 + 6431296 = 60225^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 3633481921 - 2⁵ = 3633481889 is a prime.

It is not a weakly prime, because it can be changed into another prime (3633481931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1816740960 + 1816740961.

It is an arithmetic number, because the mean of its divisors is an integer number (1816740961).

Almost surely, 2^3633481921 is an apocalyptic number.

It is an amenable number.

3633481921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3633481921 is an equidigital number, since it uses as much as digits as its factorization.

3633481921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 3633481921 is about 60278.3702583273. The cubic root of 3633481921 is about 1537.3556013594.

The spelling of 3633481921 in words is "three billion, six hundred thirty-three million, four hundred eighty-one thousand, nine hundred twenty-one".