2431661 has 2 divisors, whose sum is σ = 2431662. Its totient is φ = 2431660.

The previous prime is 2431657. The next prime is 2431673. The reversal of 2431661 is 1661342.

It is a happy number.

2431661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2175625 + 256036 = 1475^2 + 506^2 .

It is a cyclic number.

It is not a de Polignac number, because 2431661 - 2² = 2431657 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2431691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1215830 + 1215831.

It is an arithmetic number, because the mean of its divisors is an integer number (1215831).

2^2431661 is an apocalyptic number.

It is an amenable number.

2431661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2431661 is an equidigital number, since it uses as much as digits as its factorization.

2431661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 2431661 is about 1559.3784017999. The cubic root of 2431661 is about 134.4727675734.

The spelling of 2431661 in words is "two million, four hundred thirty-one thousand, six hundred sixty-one".