261228199 has 2 divisors, whose sum is σ = 261228200. Its totient is φ = 261228198.

The previous prime is 261228173. The next prime is 261228257. The reversal of 261228199 is 991822162.

261228199 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 261228199 - 2²⁵ = 227673767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261228299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130614099 + 130614100.

It is an arithmetic number, because the mean of its divisors is an integer number (130614100).

Almost surely, 2^261228199 is an apocalyptic number.

261228199 is a deficient number, since it is larger than the sum of its proper divisors (1).

261228199 is an equidigital number, since it uses as much as digits as its factorization.

261228199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 261228199 is about 16162.5554600750. Note that the first 3 decimals coincide. The cubic root of 261228199 is about 639.2538496696.

The spelling of 261228199 in words is "two hundred sixty-one million, two hundred twenty-eight thousand, one hundred ninety-nine".