1897773494429 has 2 divisors, whose sum is σ = 1897773494430. Its totient is φ = 1897773494428.

The previous prime is 1897773494413. The next prime is 1897773494431. The reversal of 1897773494429 is 9244943777981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1876083568804 + 21689925625 = 1369702^2 + 147275^2 .

It is an emirp because it is prime and its reverse (9244943777981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1897773494429 - 2⁴ = 1897773494413 is a prime.

Together with 1897773494431, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1897773494489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 948886747214 + 948886747215.

It is an arithmetic number, because the mean of its divisors is an integer number (948886747215).

Almost surely, 2^{1897773494429} is an apocalyptic number.

It is an amenable number.

1897773494429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1897773494429 is an equidigital number, since it uses as much as digits as its factorization.

1897773494429 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 768144384, while the sum is 74.

The spelling of 1897773494429 in words is "one trillion, eight hundred ninety-seven billion, seven hundred seventy-three million, four hundred ninety-four thousand, four hundred twenty-nine".