263513261 has 8 divisors (see below), whose sum is σ = 302599200. Its totient is φ = 226949040.

The previous prime is 263513251. The next prime is 263513279. The reversal of 263513261 is 162315362.

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 263513261 - 2⁶ = 263513197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263513221) 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, 630206 + ... + 630623.

It is an arithmetic number, because the mean of its divisors is an integer number (37824900).

Almost surely, 2^263513261 is an apocalyptic number.

It is an amenable number.

263513261 is a deficient number, since it is larger than the sum of its proper divisors (39085939).

263513261 is a wasteful number, since it uses less digits than its factorization.

263513261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260859.

The product of its digits is 6480, while the sum is 29.

The square root of 263513261 is about 16233.0915416627. The cubic root of 263513261 is about 641.1123729381.

The spelling of 263513261 in words is "two hundred sixty-three million, five hundred thirteen thousand, two hundred sixty-one".