261262489 has 2 divisors, whose sum is σ = 261262490. Its totient is φ = 261262488.

The previous prime is 261262481. The next prime is 261262499. The reversal of 261262489 is 984262162.

261262489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192654400 + 68608089 = 13880^2 + 8283^2 .

It is a cyclic number.

It is not a de Polignac number, because 261262489 - 2³ = 261262481 is a prime.

It is not a weakly prime, because it can be changed into another prime (261262481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130631244 + 130631245.

It is an arithmetic number, because the mean of its divisors is an integer number (130631245).

Almost surely, 2^261262489 is an apocalyptic number.

It is an amenable number.

261262489 is a deficient number, since it is larger than the sum of its proper divisors (1).

261262489 is an equidigital number, since it uses as much as digits as its factorization.

261262489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 261262489 is about 16163.6162104895. The cubic root of 261262489 is about 639.2818189005.

The spelling of 261262489 in words is "two hundred sixty-one million, two hundred sixty-two thousand, four hundred eighty-nine".