491181337 has 4 divisors (see below), whose sum is σ = 498099456. Its totient is φ = 484263220.

The previous prime is 491181319. The next prime is 491181343. The reversal of 491181337 is 733181194.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 491181337 - 2¹⁵ = 491148569 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 491181296 and 491181305.

It is not an unprimeable number, because it can be changed into a prime (491181367) 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, 3458953 + ... + 3459094.

It is an arithmetic number, because the mean of its divisors is an integer number (124524864).

Almost surely, 2^491181337 is an apocalyptic number.

It is an amenable number.

491181337 is a deficient number, since it is larger than the sum of its proper divisors (6918119).

491181337 is an equidigital number, since it uses as much as digits as its factorization.

491181337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6918118.

The product of its digits is 18144, while the sum is 37.

The square root of 491181337 is about 22162.6112405556. The cubic root of 491181337 is about 789.0065689339.

The spelling of 491181337 in words is "four hundred ninety-one million, one hundred eighty-one thousand, three hundred thirty-seven".