491849507 has 2 divisors, whose sum is σ = 491849508. Its totient is φ = 491849506.

The previous prime is 491849471. The next prime is 491849509. The reversal of 491849507 is 705948194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491849507 - 2¹⁸ = 491587363 is a prime.

It is a super-2 number, since 2×491849507² = 483831875072286098, which contains 22 as substring.

Together with 491849509, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (491849509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245924753 + 245924754.

It is an arithmetic number, because the mean of its divisors is an integer number (245924754).

Almost surely, 2^491849507 is an apocalyptic number.

491849507 is a deficient number, since it is larger than the sum of its proper divisors (1).

491849507 is an equidigital number, since it uses as much as digits as its factorization.

491849507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 491849507 is about 22177.6803791560. The cubic root of 491849507 is about 789.3641772878.

The spelling of 491849507 in words is "four hundred ninety-one million, eight hundred forty-nine thousand, five hundred seven".