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2669 = 17157

2669 has 4 divisors (see below), whose sum is σ = 2844. Its totient is φ = 2496.

The previous prime is 2663. The next prime is 2671. The reversal of 2669 is 9662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9662 = 24831.

It can be written as a sum of positive squares in 2 ways, for example, as 1444 + 1225 = 38^2 + 35^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-2669 is a prime.

It is a super-2 number, since 2×26692 = 14247122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62 + ... + 95.

It is an arithmetic number, because the mean of its divisors is an integer number (711).

22669 is an apocalyptic number.

It is an amenable number.

2669 is a deficient number, since it is larger than the sum of its proper divisors (175).

2669 is a wasteful number, since it uses less digits than its factorization.

2669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174.

The product of its digits is 648, while the sum is 23.

The square root of 2669 is about 51.6623654124. The cubic root of 2669 is about 13.8712689153.

The spelling of 2669 in words is "two thousand, six hundred sixty-nine".

Divisors: 1 17 157 2669