2261085509 has 4 divisors (see below), whose sum is σ = 2261462220.
Its totient is φ = 2260708800.
The previous prime is 2261085487. The next prime is 2261085529. The reversal of 2261085509 is 9055801622.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in 2 ways, for example, as 1749330625 + 511754884 = 41825^2 + 22622^2
It is a cyclic number.
It is not a de Polignac number, because 2261085509 - 216 = 2261019973 is a prime.
It is a super-2 number, since 2×22610855092 = 10225015358019578162, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2261085529) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179204 + ... + 191405.
It is an arithmetic number, because the mean of its divisors is an integer number (565365555).
Almost surely, 22261085509 is an apocalyptic number.
It is an amenable number.
2261085509 is a deficient number, since it is larger than the sum of its proper divisors (376711).
2261085509 is an equidigital number, since it uses as much as digits as its factorization.
2261085509 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 376710.
The product of its (nonzero) digits is 43200, while the sum is 38.
The square root of 2261085509 is about 47550.8728521360.
The cubic root of 2261085509 is about 1312.5191911812.
The spelling of 2261085509 in words is "two billion, two hundred sixty-one million, eighty-five thousand, five hundred nine".