862538809421 has 2 divisors, whose sum is σ = 862538809422. Its totient is φ = 862538809420.

The previous prime is 862538809411. The next prime is 862538809423. The reversal of 862538809421 is 124908835268.

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., 825301388521 + 37237420900 = 908461^2 + 192970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-862538809421 is a prime.

It is a Sophie Germain prime.

Together with 862538809423, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (862538809423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431269404710 + 431269404711.

It is an arithmetic number, because the mean of its divisors is an integer number (431269404711).

Almost surely, 2^862538809421 is an apocalyptic number.

It is an amenable number.

862538809421 is a deficient number, since it is larger than the sum of its proper divisors (1).

862538809421 is an equidigital number, since it uses as much as digits as its factorization.

862538809421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6635520, while the sum is 56.

The spelling of 862538809421 in words is "eight hundred sixty-two billion, five hundred thirty-eight million, eight hundred nine thousand, four hundred twenty-one".