491849923 has 2 divisors, whose sum is σ = 491849924. Its totient is φ = 491849922.

The previous prime is 491849887. The next prime is 491849927. The reversal of 491849923 is 329948194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491849923 - 2¹³ = 491841731 is a prime.

It is not a weakly prime, because it can be changed into another prime (491849927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245924961 + 245924962.

It is an arithmetic number, because the mean of its divisors is an integer number (245924962).

Almost surely, 2^491849923 is an apocalyptic number.

491849923 is a deficient number, since it is larger than the sum of its proper divisors (1).

491849923 is an equidigital number, since it uses as much as digits as its factorization.

491849923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 49.

The square root of 491849923 is about 22177.6897579527. The cubic root of 491849923 is about 789.3643998324.

The spelling of 491849923 in words is "four hundred ninety-one million, eight hundred forty-nine thousand, nine hundred twenty-three".