261308011 has 2 divisors, whose sum is σ = 261308012. Its totient is φ = 261308010.

The previous prime is 261307919. The next prime is 261308029. The reversal of 261308011 is 110803162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261308011 - 2²¹ = 259210859 is a prime.

It is a super-2 number, since 2×261308011² = 136563753225552242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261308051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130654005 + 130654006.

It is an arithmetic number, because the mean of its divisors is an integer number (130654006).

Almost surely, 2^261308011 is an apocalyptic number.

261308011 is a deficient number, since it is larger than the sum of its proper divisors (1).

261308011 is an equidigital number, since it uses as much as digits as its factorization.

261308011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 261308011 is about 16165.0243117664. The cubic root of 261308011 is about 639.3189459256.

The spelling of 261308011 in words is "two hundred sixty-one million, three hundred eight thousand, eleven".