261089153 has 8 divisors (see below), whose sum is σ = 281437800. Its totient is φ = 240778368.

The previous prime is 261089137. The next prime is 261089167. The reversal of 261089153 is 351980162.

It can be written as a sum of positive squares in 4 ways, for example, as 18601969 + 242487184 = 4313^2 + 15572^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261089153 - 2⁴ = 261089137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261089113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5783 + ... + 23571.

It is an arithmetic number, because the mean of its divisors is an integer number (35179725).

Almost surely, 2^261089153 is an apocalyptic number.

It is an amenable number.

261089153 is a deficient number, since it is larger than the sum of its proper divisors (20348647).

261089153 is a wasteful number, since it uses less digits than its factorization.

261089153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18931.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 261089153 is about 16158.2534018996. The cubic root of 261089153 is about 639.1404093054.

The spelling of 261089153 in words is "two hundred sixty-one million, eighty-nine thousand, one hundred fifty-three".