261284353 has 4 divisors (see below), whose sum is σ = 285037488. Its totient is φ = 237531220.

The previous prime is 261284351. The next prime is 261284377. The reversal of 261284353 is 353482162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261284353 - 2¹ = 261284351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261284351) 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, 11876551 + ... + 11876572.

It is an arithmetic number, because the mean of its divisors is an integer number (71259372).

Almost surely, 2^261284353 is an apocalyptic number.

It is an amenable number.

261284353 is a deficient number, since it is larger than the sum of its proper divisors (23753135).

261284353 is a wasteful number, since it uses less digits than its factorization.

261284353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23753134.

The product of its digits is 34560, while the sum is 34.

The square root of 261284353 is about 16164.2925301419. The cubic root of 261284353 is about 639.2996513722.

The spelling of 261284353 in words is "two hundred sixty-one million, two hundred eighty-four thousand, three hundred fifty-three".