10261661 has 2 divisors, whose sum is σ = 10261662. Its totient is φ = 10261660.

The previous prime is 10261639. The next prime is 10261663. The reversal of 10261661 is 16616201.

10261661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10201636 + 60025 = 3194^2 + 245^2 .

It is a cyclic number.

It is not a de Polignac number, because 10261661 - 2⁶ = 10261597 is a prime.

It is a Sophie Germain prime.

Together with 10261663, it forms a pair of twin primes.

It is a Chen 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 (10261663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5130830 + 5130831.

It is an arithmetic number, because the mean of its divisors is an integer number (5130831).

Almost surely, 2^10261661 is an apocalyptic number.

It is an amenable number.

10261661 is a deficient number, since it is larger than the sum of its proper divisors (1).

10261661 is an equidigital number, since it uses as much as digits as its factorization.

10261661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 10261661 is about 3203.3827432887. The cubic root of 10261661 is about 217.3064186772.

Adding to 10261661 its reverse (16616201), we get a palindrome (26877862).

The spelling of 10261661 in words is "ten million, two hundred sixty-one thousand, six hundred sixty-one".