263263891 has 4 divisors (see below), whose sum is σ = 287196984. Its totient is φ = 239330800.

The previous prime is 263263883. The next prime is 263263933. The reversal of 263263891 is 198362362.

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 263263891 - 2³ = 263263883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263263831) 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, 11966530 + ... + 11966551.

It is an arithmetic number, because the mean of its divisors is an integer number (71799246).

Almost surely, 2^263263891 is an apocalyptic number.

263263891 is a deficient number, since it is larger than the sum of its proper divisors (23933093).

263263891 is a wasteful number, since it uses less digits than its factorization.

263263891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23933092.

The product of its digits is 93312, while the sum is 40.

The square root of 263263891 is about 16225.4088084091. The cubic root of 263263891 is about 640.9100748963.

The spelling of 263263891 in words is "two hundred sixty-three million, two hundred sixty-three thousand, eight hundred ninety-one".