261089443 has 2 divisors, whose sum is σ = 261089444. Its totient is φ = 261089442.

The previous prime is 261089401. The next prime is 261089449. The reversal of 261089443 is 344980162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261089443 - 2¹⁷ = 260958371 is a prime.

It is not a weakly prime, because it can be changed into another prime (261089449) 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, 130544721 + 130544722.

It is an arithmetic number, because the mean of its divisors is an integer number (130544722).

Almost surely, 2^261089443 is an apocalyptic number.

261089443 is a deficient number, since it is larger than the sum of its proper divisors (1).

261089443 is an equidigital number, since it uses as much as digits as its factorization.

261089443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 261089443 is about 16158.2623756393. The cubic root of 261089443 is about 639.1406459432.

The spelling of 261089443 in words is "two hundred sixty-one million, eighty-nine thousand, four hundred forty-three".