660901 has 2 divisors, whose sum is σ = 660902. Its totient is φ = 660900.

The previous prime is 660899. The next prime is 660917. The reversal of 660901 is 109066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638401 + 22500 = 799^2 + 150^2 .

It is a cyclic number.

It is not a de Polignac number, because 660901 - 2¹ = 660899 is a prime.

Together with 660899, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330450 + 330451.

It is an arithmetic number, because the mean of its divisors is an integer number (330451).

2⁶⁶⁰⁹⁰¹ is an apocalyptic number.

It is an amenable number.

660901 is a deficient number, since it is larger than the sum of its proper divisors (1).

660901 is an equidigital number, since it uses as much as digits as its factorization.

660901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 660901 is about 812.9581785061. The cubic root of 660901 is about 87.1054782678.

Adding to 660901 its reverse (109066), we get a palindrome (769967).

The spelling of 660901 in words is "six hundred sixty thousand, nine hundred one".