3540521 has 2 divisors, whose sum is σ = 3540522. Its totient is φ = 3540520.

The previous prime is 3540503. The next prime is 3540529. The reversal of 3540521 is 1250453.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1784896 + 1755625 = 1336^2 + 1325^2 .

It is an emirp because it is prime and its reverse (1250453) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3540521 - 2⁶ = 3540457 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3540493 and 3540502.

It is not a weakly prime, because it can be changed into another prime (3540529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1770260 + 1770261.

It is an arithmetic number, because the mean of its divisors is an integer number (1770261).

Almost surely, 2^3540521 is an apocalyptic number.

It is an amenable number.

3540521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3540521 is an equidigital number, since it uses as much as digits as its factorization.

3540521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 3540521 is about 1881.6272213167. The cubic root of 3540521 is about 152.4131333648.

Adding to 3540521 its reverse (1250453), we get a palindrome (4790974).

The spelling of 3540521 in words is "three million, five hundred forty thousand, five hundred twenty-one".