491233019 has 4 divisors (see below), whose sum is σ = 491316696. Its totient is φ = 491149344.

The previous prime is 491233009. The next prime is 491233021. The reversal of 491233019 is 910332194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491233019 is a prime.

It is a super-2 number, since 2×491233019² = 482619757911708722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491233009) 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, 32309 + ... + 45014.

It is an arithmetic number, because the mean of its divisors is an integer number (122829174).

Almost surely, 2^491233019 is an apocalyptic number.

491233019 is a deficient number, since it is larger than the sum of its proper divisors (83677).

491233019 is an equidigital number, since it uses as much as digits as its factorization.

491233019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83676.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 491233019 is about 22163.7771826013. Note that the first 3 decimals coincide. The cubic root of 491233019 is about 789.0342410001.

The spelling of 491233019 in words is "four hundred ninety-one million, two hundred thirty-three thousand, nineteen".