245261 has 2 divisors, whose sum is σ = 245262. Its totient is φ = 245260.

The previous prime is 245257. The next prime is 245269. The reversal of 245261 is 162542.

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., 244036 + 1225 = 494^2 + 35^2 .

It is a cyclic number.

It is not a de Polignac number, because 245261 - 2² = 245257 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (245269) 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, 122630 + 122631.

It is an arithmetic number, because the mean of its divisors is an integer number (122631).

2²⁴⁵²⁶¹ is an apocalyptic number.

It is an amenable number.

245261 is a deficient number, since it is larger than the sum of its proper divisors (1).

245261 is an equidigital number, since it uses as much as digits as its factorization.

245261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480, while the sum is 20.

The square root of 245261 is about 495.2383264651. The cubic root of 245261 is about 62.5954594590.

The spelling of 245261 in words is "two hundred forty-five thousand, two hundred sixty-one".