3751021 has 2 divisors, whose sum is σ = 3751022. Its totient is φ = 3751020.

The previous prime is 3751009. The next prime is 3751057. The reversal of 3751021 is 1201573.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2160900 + 1590121 = 1470^2 + 1261^2 .

It is a cyclic number.

It is not a de Polignac number, because 3751021 - 2¹¹ = 3748973 is a prime.

3751021 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3751021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3751081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1875510 + 1875511.

It is an arithmetic number, because the mean of its divisors is an integer number (1875511).

Almost surely, 2^3751021 is an apocalyptic number.

It is an amenable number.

3751021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3751021 is an equidigital number, since it uses as much as digits as its factorization.

3751021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 3751021 is about 1936.7552762288. The cubic root of 3751021 is about 155.3757239489.

Adding to 3751021 its reverse (1201573), we get a palindrome (4952594).

The spelling of 3751021 in words is "three million, seven hundred fifty-one thousand, twenty-one".