491122221937 has 2 divisors, whose sum is σ = 491122221938. Its totient is φ = 491122221936.

The previous prime is 491122221929. The next prime is 491122221971. The reversal of 491122221937 is 739122221194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 313738895376 + 177383326561 = 560124^2 + 421169^2 .

It is a cyclic number.

It is not a de Polignac number, because 491122221937 - 2³ = 491122221929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491122221893 and 491122221902.

It is not a weakly prime, because it can be changed into another prime (491122621937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245561110968 + 245561110969.

It is an arithmetic number, because the mean of its divisors is an integer number (245561110969).

Almost surely, 2^491122221937 is an apocalyptic number.

It is an amenable number.

491122221937 is a deficient number, since it is larger than the sum of its proper divisors (1).

491122221937 is an equidigital number, since it uses as much as digits as its factorization.

491122221937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

It can be divided in two parts, 49112 and 2221937, that added together give a square (2271049 = 1507²).

The spelling of 491122221937 in words is "four hundred ninety-one billion, one hundred twenty-two million, two hundred twenty-one thousand, nine hundred thirty-seven".