3731621 has 2 divisors, whose sum is σ = 3731622. Its totient is φ = 3731620.

The previous prime is 3731603. The next prime is 3731627. The reversal of 3731621 is 1261373.

It is a happy number.

3731621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3648100 + 83521 = 1910^2 + 289^2 .

It is an emirp because it is prime and its reverse (1261373) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3731621 - 2⁶ = 3731557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3731627) 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, 1865810 + 1865811.

It is an arithmetic number, because the mean of its divisors is an integer number (1865811).

Almost surely, 2^3731621 is an apocalyptic number.

It is an amenable number.

3731621 is a deficient number, since it is larger than the sum of its proper divisors (1).

3731621 is an equidigital number, since it uses as much as digits as its factorization.

3731621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 23.

The square root of 3731621 is about 1931.7404069905. The cubic root of 3731621 is about 155.1073969532.

Adding to 3731621 its reverse (1261373), we get a palindrome (4992994).

The spelling of 3731621 in words is "three million, seven hundred thirty-one thousand, six hundred twenty-one".