261530263 has 4 divisors (see below), whose sum is σ = 272901168. Its totient is φ = 250159360.

The previous prime is 261530239. The next prime is 261530273. The reversal of 261530263 is 362035162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261530263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261530273) 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, 5685418 + ... + 5685463.

It is an arithmetic number, because the mean of its divisors is an integer number (68225292).

Almost surely, 2^261530263 is an apocalyptic number.

261530263 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261530263 is a deficient number, since it is larger than the sum of its proper divisors (11370905).

261530263 is a wasteful number, since it uses less digits than its factorization.

261530263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11370904.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 261530263 is about 16171.8973222068. The cubic root of 261530263 is about 639.5001492606.

The spelling of 261530263 in words is "two hundred sixty-one million, five hundred thirty thousand, two hundred sixty-three".