2661385 has 4 divisors (see below), whose sum is σ = 3193668. Its totient is φ = 2129104.

The previous prime is 2661371. The next prime is 2661391. The reversal of 2661385 is 5831662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5831662 = 2 ⋅2915831.

It can be written as a sum of positive squares in 2 ways, for example, as 822649 + 1838736 = 907^2 + 1356^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661385 - 2⁹ = 2660873 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 2¹¹ + 6⁷ + 6⁷ + 1 + 3⁷ + 8⁷ + 5³ .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266134 + ... + 266143.

It is an arithmetic number, because the mean of its divisors is an integer number (798417).

2^2661385 is an apocalyptic number.

It is an amenable number.

2661385 is a deficient number, since it is larger than the sum of its proper divisors (532283).

2661385 is an equidigital number, since it uses as much as digits as its factorization.

2661385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532282.

The product of its digits is 8640, while the sum is 31.

The square root of 2661385 is about 1631.3751867673. The cubic root of 2661385 is about 138.5806417815.

The spelling of 2661385 in words is "two million, six hundred sixty-one thousand, three hundred eighty-five".