491280403 has 4 divisors (see below), whose sum is σ = 497199528. Its totient is φ = 485361280.

The previous prime is 491280401. The next prime is 491280421. The reversal of 491280403 is 304082194.

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 491280403 - 2¹ = 491280401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491280401) 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, 2959438 + ... + 2959603.

It is an arithmetic number, because the mean of its divisors is an integer number (124299882).

Almost surely, 2^491280403 is an apocalyptic number.

491280403 is a deficient number, since it is larger than the sum of its proper divisors (5919125).

491280403 is an equidigital number, since it uses as much as digits as its factorization.

491280403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5919124.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 491280403 is about 22164.8461081957. The cubic root of 491280403 is about 789.0596100849.

The spelling of 491280403 in words is "four hundred ninety-one million, two hundred eighty thousand, four hundred three".