3775621 has 2 divisors, whose sum is σ = 3775622. Its totient is φ = 3775620.

The previous prime is 3775619. The next prime is 3775637. The reversal of 3775621 is 1265773.

3775621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3663396 + 112225 = 1914^2 + 335^2 .

It is a cyclic number.

It is not a de Polignac number, because 3775621 - 2¹ = 3775619 is a prime.

Together with 3775619, it forms a pair of twin primes.

3775621 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3775601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1887810 + 1887811.

It is an arithmetic number, because the mean of its divisors is an integer number (1887811).

Almost surely, 2^3775621 is an apocalyptic number.

It is an amenable number.

3775621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3775621 is an equidigital number, since it uses as much as digits as its factorization.

3775621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8820, while the sum is 31.

The square root of 3775621 is about 1943.0957258972. The cubic root of 3775621 is about 155.7146465537.

The spelling of 3775621 in words is "three million, seven hundred seventy-five thousand, six hundred twenty-one".