2645641 has 4 divisors (see below), whose sum is σ = 2736900. Its totient is φ = 2554384.

The previous prime is 2645639. The next prime is 2645647. The reversal of 2645641 is 1465462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1465462 = 2 ⋅732731.

It can be written as a sum of positive squares in 2 ways, for example, as 2250000 + 395641 = 1500^2 + 629^2 .

It is a cyclic number.

It is not a de Polignac number, because 2645641 - 2¹ = 2645639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2645647) 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, 45586 + ... + 45643.

It is an arithmetic number, because the mean of its divisors is an integer number (684225).

2^2645641 is an apocalyptic number.

It is an amenable number.

2645641 is a deficient number, since it is larger than the sum of its proper divisors (91259).

2645641 is an equidigital number, since it uses as much as digits as its factorization.

2645641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91258.

The product of its digits is 5760, while the sum is 28.

The square root of 2645641 is about 1626.5426523765. The cubic root of 2645641 is about 138.3068332006.

The spelling of 2645641 in words is "two million, six hundred forty-five thousand, six hundred forty-one".