491445037579 has 4 divisors (see below), whose sum is σ = 491524270776. Its totient is φ = 491365804384.

The previous prime is 491445037561. The next prime is 491445037597. The reversal of 491445037579 is 975730544194.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (491445037561) and next prime (491445037597).

It is a cyclic number.

It is not a de Polignac number, because 491445037579 - 2⁹ = 491445037067 is a prime.

It is a super-2 number, since 2×491445037579² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491445037519) 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, 39607294 + ... + 39619699.

It is an arithmetic number, because the mean of its divisors is an integer number (122881067694).

Almost surely, 2^491445037579 is an apocalyptic number.

491445037579 is a deficient number, since it is larger than the sum of its proper divisors (79233197).

491445037579 is an equidigital number, since it uses as much as digits as its factorization.

491445037579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79233196.

The product of its (nonzero) digits is 19051200, while the sum is 58.

The spelling of 491445037579 in words is "four hundred ninety-one billion, four hundred forty-five million, thirty-seven thousand, five hundred seventy-nine".