2869661 has 4 divisors (see below), whose sum is σ = 2873052. Its totient is φ = 2866272.

The previous prime is 2869649. The next prime is 2869663. The reversal of 2869661 is 1669682.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 84100 + 2785561 = 290^2 + 1669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2869661 is a prime.

It is an Ulam number.

It is a Duffinian 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 (2869663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761 + ... + 2513.

It is an arithmetic number, because the mean of its divisors is an integer number (718263).

2^2869661 is an apocalyptic number.

It is an amenable number.

2869661 is a deficient number, since it is larger than the sum of its proper divisors (3391).

2869661 is a wasteful number, since it uses less digits than its factorization.

2869661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3390.

The product of its digits is 31104, while the sum is 38.

The square root of 2869661 is about 1694.0073789686. The cubic root of 2869661 is about 142.1052747070.

The spelling of 2869661 in words is "two million, eight hundred sixty-nine thousand, six hundred sixty-one".