660251 has 2 divisors, whose sum is σ = 660252. Its totient is φ = 660250.

The previous prime is 660241. The next prime is 660271. The reversal of 660251 is 152066.

It is an a-pointer prime, because the next prime (660271) can be obtained adding 660251 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660251 is a prime.

It is not a weakly prime, because it can be changed into another prime (660241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330125 + 330126.

It is an arithmetic number, because the mean of its divisors is an integer number (330126).

2⁶⁶⁰²⁵¹ is an apocalyptic number.

660251 is a deficient number, since it is larger than the sum of its proper divisors (1).

660251 is an equidigital number, since it uses as much as digits as its factorization.

660251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 660251 is about 812.5583056003. The cubic root of 660251 is about 87.0769126518.

The spelling of 660251 in words is "six hundred sixty thousand, two hundred fifty-one".