263144491 has 4 divisors (see below), whose sum is σ = 265749984. Its totient is φ = 260539000.

The previous prime is 263144489. The next prime is 263144527. The reversal of 263144491 is 194441362.

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

It is a cyclic number.

It is not a de Polignac number, because 263144491 - 2¹ = 263144489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263154491) 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, 1302595 + ... + 1302796.

It is an arithmetic number, because the mean of its divisors is an integer number (66437496).

Almost surely, 2^263144491 is an apocalyptic number.

263144491 is a deficient number, since it is larger than the sum of its proper divisors (2605493).

263144491 is a wasteful number, since it uses less digits than its factorization.

263144491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2605492.

The product of its digits is 20736, while the sum is 34.

The square root of 263144491 is about 16221.7289769001. The cubic root of 263144491 is about 640.8131680316.

The spelling of 263144491 in words is "two hundred sixty-three million, one hundred forty-four thousand, four hundred ninety-one".