261051199 has 2 divisors, whose sum is σ = 261051200. Its totient is φ = 261051198.

The previous prime is 261051191. The next prime is 261051209. The reversal of 261051199 is 991150162.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261051199 - 2³ = 261051191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261051191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130525599 + 130525600.

It is an arithmetic number, because the mean of its divisors is an integer number (130525600).

Almost surely, 2^261051199 is an apocalyptic number.

261051199 is a deficient number, since it is larger than the sum of its proper divisors (1).

261051199 is an equidigital number, since it uses as much as digits as its factorization.

261051199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 261051199 is about 16157.0789129719. The cubic root of 261051199 is about 639.1094376235.

The spelling of 261051199 in words is "two hundred sixty-one million, fifty-one thousand, one hundred ninety-nine".