2406661 has 2 divisors, whose sum is σ = 2406662. Its totient is φ = 2406660.

The previous prime is 2406647. The next prime is 2406671. The reversal of 2406661 is 1666042.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1716100 + 690561 = 1310^2 + 831^2 .

It is a cyclic number.

It is not a de Polignac number, because 2406661 - 2⁵ = 2406629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2406631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1203330 + 1203331.

It is an arithmetic number, because the mean of its divisors is an integer number (1203331).

2^2406661 is an apocalyptic number.

It is an amenable number.

2406661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2406661 is an equidigital number, since it uses as much as digits as its factorization.

2406661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 2406661 is about 1551.3416773877. The cubic root of 2406661 is about 134.0103392928.

The spelling of 2406661 in words is "two million, four hundred six thousand, six hundred sixty-one".