3655121 has 2 divisors, whose sum is σ = 3655122. Its totient is φ = 3655120.

The previous prime is 3655111. The next prime is 3655133. The reversal of 3655121 is 1215563.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3474496 + 180625 = 1864^2 + 425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3655121 is a prime.

It is a Chen prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (3655111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1827560 + 1827561.

It is an arithmetic number, because the mean of its divisors is an integer number (1827561).

Almost surely, 2^3655121 is an apocalyptic number.

It is an amenable number.

3655121 is a deficient number, since it is larger than the sum of its proper divisors (1).

3655121 is an equidigital number, since it uses as much as digits as its factorization.

3655121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 23.

The square root of 3655121 is about 1911.8370746484. The cubic root of 3655121 is about 154.0401452656.

The spelling of 3655121 in words is "three million, six hundred fifty-five thousand, one hundred twenty-one".