2564945 has 4 divisors (see below), whose sum is σ = 3077940. Its totient is φ = 2051952.

The previous prime is 2564921. The next prime is 2564957. The reversal of 2564945 is 5494652.

It is a happy number.

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 1926544 + 638401 = 1388^2 + 799^2 .

It is a cyclic number.

It is not a de Polignac number, because 2564945 - 2¹⁰ = 2563921 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256490 + ... + 256499.

It is an arithmetic number, because the mean of its divisors is an integer number (769485).

2^2564945 is an apocalyptic number.

It is an amenable number.

2564945 is a deficient number, since it is larger than the sum of its proper divisors (512995).

2564945 is an equidigital number, since it uses as much as digits as its factorization.

2564945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512994.

The product of its digits is 43200, while the sum is 35.

The square root of 2564945 is about 1601.5445669728. The cubic root of 2564945 is about 136.8861006544.

The spelling of 2564945 in words is "two million, five hundred sixty-four thousand, nine hundred forty-five".