3628561 has 2 divisors, whose sum is σ = 3628562. Its totient is φ = 3628560.

The previous prime is 3628483. The next prime is 3628571. The reversal of 3628561 is 1658263.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2689600 + 938961 = 1640^2 + 969^2 .

It is a cyclic number.

It is not a de Polignac number, because 3628561 - 2¹³ = 3620369 is a prime.

3628561 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3628571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1814280 + 1814281.

It is an arithmetic number, because the mean of its divisors is an integer number (1814281).

Almost surely, 2^3628561 is an apocalyptic number.

It is an amenable number.

3628561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3628561 is an equidigital number, since it uses as much as digits as its factorization.

3628561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 31.

The square root of 3628561 is about 1904.8782113301. The cubic root of 3628561 is about 153.6661260646. Note that the first 3 decimals are identical.

It can be divided in two parts, 36 and 28561, that multiplied together give a square (1028196 = 1014²).

The spelling of 3628561 in words is "three million, six hundred twenty-eight thousand, five hundred sixty-one".