261155303 has 2 divisors, whose sum is σ = 261155304. Its totient is φ = 261155302.

The previous prime is 261155263. The next prime is 261155311. The reversal of 261155303 is 303551162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261155303 - 2⁸ = 261155047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261155203) 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, 130577651 + 130577652.

It is an arithmetic number, because the mean of its divisors is an integer number (130577652).

Almost surely, 2^261155303 is an apocalyptic number.

261155303 is a deficient number, since it is larger than the sum of its proper divisors (1).

261155303 is an equidigital number, since it uses as much as digits as its factorization.

261155303 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 261155303 is about 16160.3002137955. The cubic root of 261155303 is about 639.1943826545.

The spelling of 261155303 in words is "two hundred sixty-one million, one hundred fifty-five thousand, three hundred three".