4261661 has 2 divisors, whose sum is σ = 4261662. Its totient is φ = 4261660.

The previous prime is 4261651. The next prime is 4261709. The reversal of 4261661 is 1661624.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3728761 + 532900 = 1931^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 4261661 - 2⁶ = 4261597 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 4261661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4261651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2130830 + 2130831.

It is an arithmetic number, because the mean of its divisors is an integer number (2130831).

Almost surely, 2^4261661 is an apocalyptic number.

It is an amenable number.

4261661 is a deficient number, since it is larger than the sum of its proper divisors (1).

4261661 is an equidigital number, since it uses as much as digits as its factorization.

4261661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 26.

The square root of 4261661 is about 2064.3790834050. The cubic root of 4261661 is about 162.1286003199.

The spelling of 4261661 in words is "four million, two hundred sixty-one thousand, six hundred sixty-one".