261202091 has 2 divisors, whose sum is σ = 261202092. Its totient is φ = 261202090.

The previous prime is 261202069. The next prime is 261202133. The reversal of 261202091 is 190202162.

261202091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261202091 - 2¹⁰ = 261201067 is a prime.

It is not a weakly prime, because it can be changed into another prime (261202031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130601045 + 130601046.

It is an arithmetic number, because the mean of its divisors is an integer number (130601046).

Almost surely, 2^261202091 is an apocalyptic number.

261202091 is a deficient number, since it is larger than the sum of its proper divisors (1).

261202091 is an equidigital number, since it uses as much as digits as its factorization.

261202091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 261202091 is about 16161.7477705847. The cubic root of 261202091 is about 639.2325525871.

The spelling of 261202091 in words is "two hundred sixty-one million, two hundred two thousand, ninety-one".