261055219 has 2 divisors, whose sum is σ = 261055220. Its totient is φ = 261055218.

The previous prime is 261055217. The next prime is 261055229. The reversal of 261055219 is 912550162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261055219 - 2¹ = 261055217 is a prime.

It is a super-2 number, since 2×261055219² = 136299654734275922, which contains 22 as substring.

Together with 261055217, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (261055217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130527609 + 130527610.

It is an arithmetic number, because the mean of its divisors is an integer number (130527610).

Almost surely, 2^261055219 is an apocalyptic number.

261055219 is a deficient number, since it is larger than the sum of its proper divisors (1).

261055219 is an equidigital number, since it uses as much as digits as its factorization.

261055219 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 261055219 is about 16157.2033161683. The cubic root of 261055219 is about 639.1127182146.

The spelling of 261055219 in words is "two hundred sixty-one million, fifty-five thousand, two hundred nineteen".