491892449 has 4 divisors (see below), whose sum is σ = 492117936. Its totient is φ = 491666964.

The previous prime is 491892419. The next prime is 491892487. The reversal of 491892449 is 944298194.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491892449 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 491892397 and 491892406.

It is not an unprimeable number, because it can be changed into a prime (491892419) 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, 109439 + ... + 113844.

It is an arithmetic number, because the mean of its divisors is an integer number (123029484).

Almost surely, 2^491892449 is an apocalyptic number.

It is an amenable number.

491892449 is a deficient number, since it is larger than the sum of its proper divisors (225487).

491892449 is a wasteful number, since it uses less digits than its factorization.

491892449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225486.

The product of its digits is 746496, while the sum is 50.

The square root of 491892449 is about 22178.6484935399. The cubic root of 491892449 is about 789.3871490095.

The spelling of 491892449 in words is "four hundred ninety-one million, eight hundred ninety-two thousand, four hundred forty-nine".