2645261 has 4 divisors (see below), whose sum is σ = 2730624. Its totient is φ = 2559900.

The previous prime is 2645257. The next prime is 2645263. The reversal of 2645261 is 1625462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1625462 = 2 ⋅812731.

It is a cyclic number.

It is not a de Polignac number, because 2645261 - 2² = 2645257 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2645261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645263) 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, 42635 + ... + 42696.

It is an arithmetic number, because the mean of its divisors is an integer number (682656).

2^2645261 is an apocalyptic number.

It is an amenable number.

2645261 is a deficient number, since it is larger than the sum of its proper divisors (85363).

2645261 is an equidigital number, since it uses as much as digits as its factorization.

2645261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85362.

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

The square root of 2645261 is about 1626.4258359974. The cubic root of 2645261 is about 138.3002110986.

The spelling of 2645261 in words is "two million, six hundred forty-five thousand, two hundred sixty-one".