261019700089 has 2 divisors, whose sum is σ = 261019700090. Its totient is φ = 261019700088.

The previous prime is 261019700087. The next prime is 261019700101. The reversal of 261019700089 is 980007910162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 226495087225 + 34524612864 = 475915^2 + 185808^2 .

It is a cyclic number.

It is not a de Polignac number, because 261019700089 - 2¹ = 261019700087 is a prime.

Together with 261019700087, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (261019700087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130509850044 + 130509850045.

It is an arithmetic number, because the mean of its divisors is an integer number (130509850045).

Almost surely, 2^261019700089 is an apocalyptic number.

It is an amenable number.

261019700089 is a deficient number, since it is larger than the sum of its proper divisors (1).

261019700089 is an equidigital number, since it uses as much as digits as its factorization.

261019700089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 43.

The spelling of 261019700089 in words is "two hundred sixty-one billion, nineteen million, seven hundred thousand, eighty-nine".