261136263 has 8 divisors (see below), whose sum is σ = 348530800. Its totient is φ = 173916288.

The previous prime is 261136261. The next prime is 261136279. The reversal of 261136263 is 362631162.

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

It is not a de Polignac number, because 261136263 - 2¹ = 261136261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261136263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261136261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40108 + ... + 46161.

It is an arithmetic number, because the mean of its divisors is an integer number (43566350).

Almost surely, 2^261136263 is an apocalyptic number.

261136263 is a deficient number, since it is larger than the sum of its proper divisors (87394537).

261136263 is a wasteful number, since it uses less digits than its factorization.

261136263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87281.

The product of its digits is 7776, while the sum is 30.

The square root of 261136263 is about 16159.7111050910. The cubic root of 261136263 is about 639.1788484025.

The spelling of 261136263 in words is "two hundred sixty-one million, one hundred thirty-six thousand, two hundred sixty-three".