491280249 has 4 divisors (see below), whose sum is σ = 655040336. Its totient is φ = 327520164.

The previous prime is 491280241. The next prime is 491280259. The reversal of 491280249 is 942082194.

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 491280249 - 2³ = 491280241 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (491280241) 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, 81880039 + ... + 81880044.

It is an arithmetic number, because the mean of its divisors is an integer number (163760084).

Almost surely, 2^491280249 is an apocalyptic number.

It is an amenable number.

491280249 is a deficient number, since it is larger than the sum of its proper divisors (163760087).

491280249 is a wasteful number, since it uses less digits than its factorization.

491280249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163760086.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 491280249 is about 22164.8426342259. The cubic root of 491280249 is about 789.0595276369.

The spelling of 491280249 in words is "four hundred ninety-one million, two hundred eighty thousand, two hundred forty-nine".