261026243 has 2 divisors, whose sum is σ = 261026244. Its totient is φ = 261026242.

The previous prime is 261026221. The next prime is 261026251. The reversal of 261026243 is 342620162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261026243 - 2⁸ = 261025987 is a prime.

It is not a weakly prime, because it can be changed into another prime (261026263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130513121 + 130513122.

It is an arithmetic number, because the mean of its divisors is an integer number (130513122).

Almost surely, 2^261026243 is an apocalyptic number.

261026243 is a deficient number, since it is larger than the sum of its proper divisors (1).

261026243 is an equidigital number, since it uses as much as digits as its factorization.

261026243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 261026243 is about 16156.3066014482. The cubic root of 261026243 is about 639.0890710907.

The spelling of 261026243 in words is "two hundred sixty-one million, twenty-six thousand, two hundred forty-three".