491428079 has 4 divisors (see below), whose sum is σ = 491805384. Its totient is φ = 491050776.

The previous prime is 491428039. The next prime is 491428081. The reversal of 491428079 is 970824194.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 970824194 = 2 ⋅485412097.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-491428079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491428039) 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, 186692 + ... + 189305.

It is an arithmetic number, because the mean of its divisors is an integer number (122951346).

Almost surely, 2^491428079 is an apocalyptic number.

491428079 is a deficient number, since it is larger than the sum of its proper divisors (377305).

491428079 is a wasteful number, since it uses less digits than its factorization.

491428079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377304.

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 491428079 is about 22168.1771690863. The cubic root of 491428079 is about 789.1386643905.

The spelling of 491428079 in words is "four hundred ninety-one million, four hundred twenty-eight thousand, seventy-nine".