2669561 has 8 divisors (see below), whose sum is σ = 2840904. Its totient is φ = 2499840.

The previous prime is 2669549. The next prime is 2669581. The reversal of 2669561 is 1659662.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 109561 + 2560000 = 331^2 + 1600^2 .

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 2669561 - 2⁶ = 2669497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2669521) 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, 6131 + ... + 6551.

It is an arithmetic number, because the mean of its divisors is an integer number (355113).

2^2669561 is an apocalyptic number.

It is an amenable number.

2669561 is a deficient number, since it is larger than the sum of its proper divisors (171343).

2669561 is a wasteful number, since it uses less digits than its factorization.

2669561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811.

The product of its digits is 19440, while the sum is 35.

The square root of 2669561 is about 1633.8791264962. The cubic root of 2669561 is about 138.7224071960.

The spelling of 2669561 in words is "two million, six hundred sixty-nine thousand, five hundred sixty-one".