3605881 has 2 divisors, whose sum is σ = 3605882. Its totient is φ = 3605880.

The previous prime is 3605879. The next prime is 3605891. The reversal of 3605881 is 1885063.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3297856 + 308025 = 1816^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 3605881 - 2¹ = 3605879 is a prime.

It is a super-2 number, since 2×3605881² = 26004755572322, which contains 22 as substring.

Together with 3605879, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3605821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1802940 + 1802941.

It is an arithmetic number, because the mean of its divisors is an integer number (1802941).

Almost surely, 2^3605881 is an apocalyptic number.

It is an amenable number.

3605881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3605881 is an equidigital number, since it uses as much as digits as its factorization.

3605881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 3605881 is about 1898.9157432598. The cubic root of 3605881 is about 153.3452978482.

It can be divided in two parts, 360 and 5881, that added together give a square (6241 = 79²).

The spelling of 3605881 in words is "three million, six hundred five thousand, eight hundred eighty-one".