261126259 has 2 divisors, whose sum is σ = 261126260. Its totient is φ = 261126258.

The previous prime is 261126241. The next prime is 261126287. The reversal of 261126259 is 952621162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261126259 - 2²⁷ = 126908531 is a prime.

It is not a weakly prime, because it can be changed into another prime (261126059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130563129 + 130563130.

It is an arithmetic number, because the mean of its divisors is an integer number (130563130).

Almost surely, 2^261126259 is an apocalyptic number.

261126259 is a deficient number, since it is larger than the sum of its proper divisors (1).

261126259 is an equidigital number, since it uses as much as digits as its factorization.

261126259 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 261126259 is about 16159.4015668898. The cubic root of 261126259 is about 639.1706860906.

The spelling of 261126259 in words is "two hundred sixty-one million, one hundred twenty-six thousand, two hundred fifty-nine".