427191821449 has 2 divisors, whose sum is σ = 427191821450. Its totient is φ = 427191821448.

The previous prime is 427191821431. The next prime is 427191821503. The reversal of 427191821449 is 944128191724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 272789977849 + 154401843600 = 522293^2 + 392940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-427191821449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 427191821396 and 427191821405.

It is not a weakly prime, because it can be changed into another prime (427191825449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213595910724 + 213595910725.

It is an arithmetic number, because the mean of its divisors is an integer number (213595910725).

Almost surely, 2^427191821449 is an apocalyptic number.

It is an amenable number.

427191821449 is a deficient number, since it is larger than the sum of its proper divisors (1).

427191821449 is an equidigital number, since it uses as much as digits as its factorization.

427191821449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 52.

The spelling of 427191821449 in words is "four hundred twenty-seven billion, one hundred ninety-one million, eight hundred twenty-one thousand, four hundred forty-nine".