263916489 has 4 divisors (see below), whose sum is σ = 351888656. Its totient is φ = 175944324.

The previous prime is 263916481. The next prime is 263916509. The reversal of 263916489 is 984619362.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 263916489 - 2³ = 263916481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (263916481) 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 3 ways as a sum of consecutive naturals, for example, 43986079 + ... + 43986084.

It is an arithmetic number, because the mean of its divisors is an integer number (87972164).

Almost surely, 2^263916489 is an apocalyptic number.

It is an amenable number.

263916489 is a deficient number, since it is larger than the sum of its proper divisors (87972167).

263916489 is an equidigital number, since it uses as much as digits as its factorization.

263916489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87972166.

The product of its digits is 559872, while the sum is 48.

The square root of 263916489 is about 16245.5067326323. The cubic root of 263916489 is about 641.4392163404.

It can be divided in two parts, 2639164 and 89, that added together give a triangular number (2639253 = T₂₂₉₇).

The spelling of 263916489 in words is "two hundred sixty-three million, nine hundred sixteen thousand, four hundred eighty-nine".