4013621 has 2 divisors, whose sum is σ = 4013622. Its totient is φ = 4013620.

The previous prime is 4013591. The next prime is 4013623. The reversal of 4013621 is 1263104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3845521 + 168100 = 1961^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 4013621 - 2⁶ = 4013557 is a prime.

It is a super-2 number, since 2×4013621² = 32218307063282, which contains 22 as substring.

Together with 4013623, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4013621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4013623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2006810 + 2006811.

It is an arithmetic number, because the mean of its divisors is an integer number (2006811).

Almost surely, 2^4013621 is an apocalyptic number.

It is an amenable number.

4013621 is a deficient number, since it is larger than the sum of its proper divisors (1).

4013621 is an equidigital number, since it uses as much as digits as its factorization.

4013621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 4013621 is about 2003.4023559934. The cubic root of 4013621 is about 158.9200843076.

Adding to 4013621 its reverse (1263104), we get a palindrome (5276725).

The spelling of 4013621 in words is "four million, thirteen thousand, six hundred twenty-one".