261916353 has 6 divisors (see below), whose sum is σ = 378323634. Its totient is φ = 174610896.

The previous prime is 261916339. The next prime is 261916357. The reversal of 261916353 is 353619162.

261916353 is a `hidden beast` number, since 2 + 6 + 19 + 1 + 635 + 3 = 666.

261916353 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 189530289 + 72386064 = 13767^2 + 8508^2 .

It is not a de Polignac number, because 261916353 - 2⁸ = 261916097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261916357) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14550900 + ... + 14550917.

It is an arithmetic number, because the mean of its divisors is an integer number (63053939).

Almost surely, 2^261916353 is an apocalyptic number.

It is an amenable number.

261916353 is a deficient number, since it is larger than the sum of its proper divisors (116407281).

261916353 is a wasteful number, since it uses less digits than its factorization.

261916353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29101823 (or 29101820 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 261916353 is about 16183.8299855133. The cubic root of 261916353 is about 639.8146867445.

The spelling of 261916353 in words is "two hundred sixty-one million, nine hundred sixteen thousand, three hundred fifty-three".