261799 has 2 divisors, whose sum is σ = 261800. Its totient is φ = 261798.

The previous prime is 261791. The next prime is 261823. The reversal of 261799 is 997162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261799 - 2³ = 261791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130899 + 130900.

It is an arithmetic number, because the mean of its divisors is an integer number (130900).

2²⁶¹⁷⁹⁹ is an apocalyptic number.

261799 is a deficient number, since it is larger than the sum of its proper divisors (1).

261799 is an equidigital number, since it uses as much as digits as its factorization.

261799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6804, while the sum is 34.

The square root of 261799 is about 511.6629750138. The cubic root of 261799 is about 63.9719115024.

The spelling of 261799 in words is "two hundred sixty-one thousand, seven hundred ninety-nine".