2661361 has 4 divisors (see below), whose sum is σ = 2697892. Its totient is φ = 2624832.

The previous prime is 2661341. The next prime is 2661371. The reversal of 2661361 is 1631662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1631662 = 2 ⋅815831.

It can be written as a sum of positive squares in 2 ways, for example, as 1739761 + 921600 = 1319^2 + 960^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661361 - 2⁷ = 2661233 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18156 + ... + 18301.

It is an arithmetic number, because the mean of its divisors is an integer number (674473).

2^2661361 is an apocalyptic number.

It is an amenable number.

2661361 is a deficient number, since it is larger than the sum of its proper divisors (36531).

2661361 is an equidigital number, since it uses as much as digits as its factorization.

2661361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36530.

The product of its digits is 1296, while the sum is 25.

The square root of 2661361 is about 1631.3678309934. The cubic root of 2661361 is about 138.5802252132.

The spelling of 2661361 in words is "two million, six hundred sixty-one thousand, three hundred sixty-one".