261335027 has 2 divisors, whose sum is σ = 261335028. Its totient is φ = 261335026.

The previous prime is 261335023. The next prime is 261335047. The reversal of 261335027 is 720533162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261335027 - 2² = 261335023 is a prime.

It is not a weakly prime, because it can be changed into another prime (261335023) 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, 130667513 + 130667514.

It is an arithmetic number, because the mean of its divisors is an integer number (130667514).

Almost surely, 2^261335027 is an apocalyptic number.

261335027 is a deficient number, since it is larger than the sum of its proper divisors (1).

261335027 is an equidigital number, since it uses as much as digits as its factorization.

261335027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 261335027 is about 16165.8599214518. The cubic root of 261335027 is about 639.3409777102.

Adding to 261335027 its reverse (720533162), we get a palindrome (981868189).

The spelling of 261335027 in words is "two hundred sixty-one million, three hundred thirty-five thousand, twenty-seven".