810379261381 has 2 divisors, whose sum is σ = 810379261382. Its totient is φ = 810379261380.

The previous prime is 810379261313. The next prime is 810379261507. The reversal of 810379261381 is 183162973018.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659498289025 + 150880972356 = 812095^2 + 388434^2 .

It is a cyclic number.

It is not a de Polignac number, because 810379261381 - 2⁹ = 810379260869 is a prime.

It is a super-2 number, since 2×810379261381² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (810379267381) 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, 405189630690 + 405189630691.

It is an arithmetic number, because the mean of its divisors is an integer number (405189630691).

Almost surely, 2^810379261381 is an apocalyptic number.

It is an amenable number.

810379261381 is a deficient number, since it is larger than the sum of its proper divisors (1).

810379261381 is an equidigital number, since it uses as much as digits as its factorization.

810379261381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 810379261381 in words is "eight hundred ten billion, three hundred seventy-nine million, two hundred sixty-one thousand, three hundred eighty-one".