4401581 has 2 divisors, whose sum is σ = 4401582. Its totient is φ = 4401580.

The previous prime is 4401563. The next prime is 4401601. The reversal of 4401581 is 1851044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4268356 + 133225 = 2066^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 4401581 - 2⁶ = 4401517 is a prime.

It is a super-2 number, since 2×4401581² = 38747830599122, which contains 22 as substring.

It is a Chen prime.

It is equal to p₃₀₉₄₃₄ and since 4401581 and 309434 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4401281) 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, 2200790 + 2200791.

It is an arithmetic number, because the mean of its divisors is an integer number (2200791).

Almost surely, 2^4401581 is an apocalyptic number.

It is an amenable number.

4401581 is a deficient number, since it is larger than the sum of its proper divisors (1).

4401581 is an equidigital number, since it uses as much as digits as its factorization.

4401581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 4401581 is about 2097.9945185820. The cubic root of 4401581 is about 163.8838782385.

Adding to 4401581 its sum of digits (23), we get a square (4401604 = 2098²).

The spelling of 4401581 in words is "four million, four hundred one thousand, five hundred eighty-one".