3750221 has 2 divisors, whose sum is σ = 3750222. Its totient is φ = 3750220.

The previous prime is 3750211. The next prime is 3750223. The reversal of 3750221 is 1220573.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3204100 + 546121 = 1790^2 + 739^2 .

It is a cyclic number.

It is not a de Polignac number, because 3750221 - 2⁶ = 3750157 is a prime.

It is a Sophie Germain prime.

Together with 3750223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3750193 and 3750202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3750223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1875110 + 1875111.

It is an arithmetic number, because the mean of its divisors is an integer number (1875111).

Almost surely, 2^3750221 is an apocalyptic number.

It is an amenable number.

3750221 is a deficient number, since it is larger than the sum of its proper divisors (1).

3750221 is an equidigital number, since it uses as much as digits as its factorization.

3750221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 420, while the sum is 20.

The square root of 3750221 is about 1936.5487342177. The cubic root of 3750221 is about 155.3646772306.

Adding to 3750221 its reverse (1220573), we get a palindrome (4970794).

The spelling of 3750221 in words is "three million, seven hundred fifty thousand, two hundred twenty-one".