261284659 has 2 divisors, whose sum is σ = 261284660. Its totient is φ = 261284658.

The previous prime is 261284651. The next prime is 261284671. The reversal of 261284659 is 956482162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261284659 - 2³ = 261284651 is a prime.

It is not a weakly prime, because it can be changed into another prime (261284651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130642329 + 130642330.

It is an arithmetic number, because the mean of its divisors is an integer number (130642330).

Almost surely, 2^261284659 is an apocalyptic number.

261284659 is a deficient number, since it is larger than the sum of its proper divisors (1).

261284659 is an equidigital number, since it uses as much as digits as its factorization.

261284659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The square root of 261284659 is about 16164.3019954466. The cubic root of 261284659 is about 639.2999009415.

The spelling of 261284659 in words is "two hundred sixty-one million, two hundred eighty-four thousand, six hundred fifty-nine".