871254121697 has 2 divisors, whose sum is σ = 871254121698. Its totient is φ = 871254121696.

The previous prime is 871254121631. The next prime is 871254121711. The reversal of 871254121697 is 796121452178.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 707812611856 + 163441509841 = 841316^2 + 404279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-871254121697 is a prime.

It is not a weakly prime, because it can be changed into another prime (871254120697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435627060848 + 435627060849.

It is an arithmetic number, because the mean of its divisors is an integer number (435627060849).

Almost surely, 2^871254121697 is an apocalyptic number.

It is an amenable number.

871254121697 is a deficient number, since it is larger than the sum of its proper divisors (1).

871254121697 is an equidigital number, since it uses as much as digits as its factorization.

871254121697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1693440, while the sum is 53.

The spelling of 871254121697 in words is "eight hundred seventy-one billion, two hundred fifty-four million, one hundred twenty-one thousand, six hundred ninety-seven".