2661409 has 2 divisors, whose sum is σ = 2661410. Its totient is φ = 2661408.

The previous prime is 2661403. The next prime is 2661413. The reversal of 2661409 is 9041662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2650384 + 11025 = 1628^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661409 - 2²¹ = 564257 is a prime.

It is not a weakly prime, because it can be changed into another prime (2661403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330704 + 1330705.

It is an arithmetic number, because the mean of its divisors is an integer number (1330705).

2^2661409 is an apocalyptic number.

It is an amenable number.

2661409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661409 is an equidigital number, since it uses as much as digits as its factorization.

2661409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2661409 is about 1631.3825425080. The cubic root of 2661409 is about 138.5810583472.

The spelling of 2661409 in words is "two million, six hundred sixty-one thousand, four hundred nine".