261913087 has 2 divisors, whose sum is σ = 261913088. Its totient is φ = 261913086.

The previous prime is 261913073. The next prime is 261913103. The reversal of 261913087 is 780319162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261913087 - 2¹⁵ = 261880319 is a prime.

It is a Chen prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261913037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130956543 + 130956544.

It is an arithmetic number, because the mean of its divisors is an integer number (130956544).

Almost surely, 2^261913087 is an apocalyptic number.

261913087 is a deficient number, since it is larger than the sum of its proper divisors (1).

261913087 is an equidigital number, since it uses as much as digits as its factorization.

261913087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 261913087 is about 16183.7290820132. The cubic root of 261913087 is about 639.8120273160.

The spelling of 261913087 in words is "two hundred sixty-one million, nine hundred thirteen thousand, eighty-seven".