2645081 has 4 divisors (see below), whose sum is σ = 2800692. Its totient is φ = 2489472.

The previous prime is 2645063. The next prime is 2645087. The reversal of 2645081 is 1805462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1243225 + 1401856 = 1115^2 + 1184^2 .

It is a cyclic number.

It is not a de Polignac number, because 2645081 - 2¹⁴ = 2628697 is a prime.

It is a super-2 number, since 2×2645081² = 13992906993122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2645081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2645087) 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, 77780 + ... + 77813.

It is an arithmetic number, because the mean of its divisors is an integer number (700173).

2^2645081 is an apocalyptic number.

It is an amenable number.

2645081 is a deficient number, since it is larger than the sum of its proper divisors (155611).

2645081 is a wasteful number, since it uses less digits than its factorization.

2645081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155610.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2645081 is about 1626.3704989946. The cubic root of 2645081 is about 138.2970740922.

The spelling of 2645081 in words is "two million, six hundred forty-five thousand, eighty-one".