491126019 has 4 divisors (see below), whose sum is σ = 654834696. Its totient is φ = 327417344.

The previous prime is 491126011. The next prime is 491126029. The reversal of 491126019 is 910621194.

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 491126019 - 2³ = 491126011 is a prime.

It is a super-2 number, since 2×491126019² = 482409533077576722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (491126011) 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, 81854334 + ... + 81854339.

It is an arithmetic number, because the mean of its divisors is an integer number (163708674).

Almost surely, 2^491126019 is an apocalyptic number.

491126019 is a deficient number, since it is larger than the sum of its proper divisors (163708677).

491126019 is a wasteful number, since it uses less digits than its factorization.

491126019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163708676.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 491126019 is about 22161.3632026552. The cubic root of 491126019 is about 788.9769478953.

The spelling of 491126019 in words is "four hundred ninety-one million, one hundred twenty-six thousand, nineteen".