2945661 has 4 divisors (see below), whose sum is σ = 3927552. Its totient is φ = 1963772.

The previous prime is 2945659. The next prime is 2945669. The reversal of 2945661 is 1665492.

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.

It is a cyclic number.

It is not a de Polignac number, because 2945661 - 2¹ = 2945659 is a prime.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2945669) 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, 490941 + ... + 490946.

It is an arithmetic number, because the mean of its divisors is an integer number (981888).

2^2945661 is an apocalyptic number.

It is an amenable number.

2945661 is a deficient number, since it is larger than the sum of its proper divisors (981891).

2945661 is an equidigital number, since it uses as much as digits as its factorization.

2945661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981890.

The product of its digits is 12960, while the sum is 33.

The square root of 2945661 is about 1716.2928071865. The cubic root of 2945661 is about 143.3488637700.

The spelling of 2945661 in words is "two million, nine hundred forty-five thousand, six hundred sixty-one".