3561521 has 2 divisors, whose sum is σ = 3561522. Its totient is φ = 3561520.

The previous prime is 3561511. The next prime is 3561529. The reversal of 3561521 is 1251653.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3474496 + 87025 = 1864^2 + 295^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3561521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3561529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1780760 + 1780761.

It is an arithmetic number, because the mean of its divisors is an integer number (1780761).

Almost surely, 2^3561521 is an apocalyptic number.

It is an amenable number.

3561521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3561521 is an equidigital number, since it uses as much as digits as its factorization.

3561521 is an evil number, because the sum of its binary digits is even.

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

The square root of 3561521 is about 1887.1992475624. The cubic root of 3561521 is about 152.7138770955.

The spelling of 3561521 in words is "three million, five hundred sixty-one thousand, five hundred twenty-one".