261226393 has 2 divisors, whose sum is σ = 261226394. Its totient is φ = 261226392.

The previous prime is 261226391. The next prime is 261226411. The reversal of 261226393 is 393622162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134258569 + 126967824 = 11587^2 + 11268^2 .

It is a cyclic number.

It is not a de Polignac number, because 261226393 - 2¹ = 261226391 is a prime.

Together with 261226391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (261226391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130613196 + 130613197.

It is an arithmetic number, because the mean of its divisors is an integer number (130613197).

Almost surely, 2^261226393 is an apocalyptic number.

It is an amenable number.

261226393 is a deficient number, since it is larger than the sum of its proper divisors (1).

261226393 is an equidigital number, since it uses as much as digits as its factorization.

261226393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 34.

The square root of 261226393 is about 16162.4995901005. The cubic root of 261226393 is about 639.2523765067.

The spelling of 261226393 in words is "two hundred sixty-one million, two hundred twenty-six thousand, three hundred ninety-three".