2051645 has 8 divisors (see below), whose sum is σ = 2606904. Its totient is φ = 1544704.

The previous prime is 2051641. The next prime is 2051653. The reversal of 2051645 is 5461502.

It can be written as a sum of positive squares in 4 ways, for example, as 606841 + 1444804 = 779^2 + 1202^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2051645 - 2² = 2051641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 2051645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11984 + ... + 12153.

It is an arithmetic number, because the mean of its divisors is an integer number (325863).

2^2051645 is an apocalyptic number.

It is an amenable number.

2051645 is a deficient number, since it is larger than the sum of its proper divisors (555259).

2051645 is a wasteful number, since it uses less digits than its factorization.

2051645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24159.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2051645 is about 1432.3564500501. The cubic root of 2051645 is about 127.0673790476.

The spelling of 2051645 in words is "two million, fifty-one thousand, six hundred forty-five".