263530861 has 12 divisors (see below), whose sum is σ = 292665436. Its totient is φ = 237093120.

The previous prime is 263530853. The next prime is 263530867. The reversal of 263530861 is 168035362.

It can be written as a sum of positive squares in 2 ways, for example, as 68062500 + 195468361 = 8250^2 + 13981^2 .

It is not a de Polignac number, because 263530861 - 2³ = 263530853 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263530867) 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 11 ways as a sum of consecutive naturals, for example, 511 + ... + 22963.

Almost surely, 2^263530861 is an apocalyptic number.

It is an amenable number.

263530861 is a deficient number, since it is larger than the sum of its proper divisors (29134575).

263530861 is a wasteful number, since it uses less digits than its factorization.

263530861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22572 (or 22561 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 263530861 is about 16233.6336351416. The cubic root of 263530861 is about 641.1266458777.

The spelling of 263530861 in words is "two hundred sixty-three million, five hundred thirty thousand, eight hundred sixty-one".