491381356 has 6 divisors (see below), whose sum is σ = 859917380. Its totient is φ = 245690676.

The previous prime is 491381329. The next prime is 491381357. The reversal of 491381356 is 653183194.

It is not an unprimeable number, because it can be changed into a prime (491381357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61422666 + ... + 61422673.

Almost surely, 2^491381356 is an apocalyptic number.

It is an amenable number.

491381356 is a deficient number, since it is larger than the sum of its proper divisors (368536024).

491381356 is a wasteful number, since it uses less digits than its factorization.

491381356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122845343 (or 122845341 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 491381356 is about 22167.1233135921. The cubic root of 491381356 is about 789.1136542239.

The spelling of 491381356 in words is "four hundred ninety-one million, three hundred eighty-one thousand, three hundred fifty-six".