261202589 has 2 divisors, whose sum is σ = 261202590. Its totient is φ = 261202588.

The previous prime is 261202583. The next prime is 261202657. The reversal of 261202589 is 985202162.

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., 154803364 + 106399225 = 12442^2 + 10315^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261202589 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 (261202583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130601294 + 130601295.

It is an arithmetic number, because the mean of its divisors is an integer number (130601295).

Almost surely, 2^261202589 is an apocalyptic number.

It is an amenable number.

261202589 is a deficient number, since it is larger than the sum of its proper divisors (1).

261202589 is an equidigital number, since it uses as much as digits as its factorization.

261202589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 261202589 is about 16161.7631773269. The cubic root of 261202589 is about 639.2329588340.

The spelling of 261202589 in words is "two hundred sixty-one million, two hundred two thousand, five hundred eighty-nine".