261005099 has 2 divisors, whose sum is σ = 261005100. Its totient is φ = 261005098.

The previous prime is 261004973. The next prime is 261005117. The reversal of 261005099 is 990500162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261005099 - 2¹⁶ = 260939563 is a prime.

It is not a weakly prime, because it can be changed into another prime (261005599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130502549 + 130502550.

It is an arithmetic number, because the mean of its divisors is an integer number (130502550).

Almost surely, 2^261005099 is an apocalyptic number.

261005099 is a deficient number, since it is larger than the sum of its proper divisors (1).

261005099 is an equidigital number, since it uses as much as digits as its factorization.

261005099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4860, while the sum is 32.

The square root of 261005099 is about 16155.6522307210. The cubic root of 261005099 is about 639.0718145063.

The spelling of 261005099 in words is "two hundred sixty-one million, five thousand, ninety-nine".