774842897 has 2 divisors, whose sum is σ = 774842898. Its totient is φ = 774842896.

The previous prime is 774842891. The next prime is 774842899. The reversal of 774842897 is 798248477.

It is a happy number.

It is a Cunningham number, because it is equal to 27836²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 774842896 + 1 = 27836^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 774842897 - 2¹⁴ = 774826513 is a prime.

Together with 774842899, 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 (774842891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387421448 + 387421449.

It is an arithmetic number, because the mean of its divisors is an integer number (387421449).

Almost surely, 2^774842897 is an apocalyptic number.

It is an amenable number.

774842897 is a deficient number, since it is larger than the sum of its proper divisors (1).

774842897 is an equidigital number, since it uses as much as digits as its factorization.

774842897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6322176, while the sum is 56.

The square root of 774842897 is about 27836.0000179624. Note that the first 4 decimals coincide. The cubic root of 774842897 is about 918.4832036220.

The spelling of 774842897 in words is "seven hundred seventy-four million, eight hundred forty-two thousand, eight hundred ninety-seven".