318498491 has 2 divisors, whose sum is σ = 318498492. Its totient is φ = 318498490.

The previous prime is 318498449. The next prime is 318498493. The reversal of 318498491 is 194894813.

It is a strong prime.

It is an emirp because it is prime and its reverse (194894813) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318498491 is a prime.

Together with 318498493, 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 (318498493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159249245 + 159249246.

It is an arithmetic number, because the mean of its divisors is an integer number (159249246).

Almost surely, 2^318498491 is an apocalyptic number.

318498491 is a deficient number, since it is larger than the sum of its proper divisors (1).

318498491 is an equidigital number, since it uses as much as digits as its factorization.

318498491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 47.

The square root of 318498491 is about 17846.5260204893. The cubic root of 318498491 is about 682.9188909212.

The spelling of 318498491 in words is "three hundred eighteen million, four hundred ninety-eight thousand, four hundred ninety-one".