3555521 has 2 divisors, whose sum is σ = 3555522. Its totient is φ = 3555520.

The previous prime is 3555509. The next prime is 3555551. The reversal of 3555521 is 1255553.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2265025 + 1290496 = 1505^2 + 1136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3555521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3555551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1777760 + 1777761.

It is an arithmetic number, because the mean of its divisors is an integer number (1777761).

Almost surely, 2^3555521 is an apocalyptic number.

It is an amenable number.

3555521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3555521 is an equidigital number, since it uses as much as digits as its factorization.

3555521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3750, while the sum is 26.

The square root of 3555521 is about 1885.6089202165. The cubic root of 3555521 is about 152.6280712192.

Subtracting from 3555521 its reverse (1255553), we obtain a cube (2299968 = 132³).

It can be divided in two parts, 355552 and 1, that added together give a palindrome (355553).

The spelling of 3555521 in words is "three million, five hundred fifty-five thousand, five hundred twenty-one".