2661245 has 4 divisors (see below), whose sum is σ = 3193500. Its totient is φ = 2128992.

The previous prime is 2661233. The next prime is 2661251. The reversal of 2661245 is 5421662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5421662 = 2 ⋅2710831.

It can be written as a sum of positive squares in 2 ways, for example, as 1522756 + 1138489 = 1234^2 + 1067^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661245 - 2⁶ = 2661181 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266120 + ... + 266129.

It is an arithmetic number, because the mean of its divisors is an integer number (798375).

2^2661245 is an apocalyptic number.

It is an amenable number.

2661245 is a deficient number, since it is larger than the sum of its proper divisors (532255).

2661245 is an equidigital number, since it uses as much as digits as its factorization.

2661245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532254.

The product of its digits is 2880, while the sum is 26.

The square root of 2661245 is about 1631.3322776185. The cubic root of 2661245 is about 138.5782117648.

The spelling of 2661245 in words is "two million, six hundred sixty-one thousand, two hundred forty-five".