810881439461 has 2 divisors, whose sum is σ = 810881439462. Its totient is φ = 810881439460.

The previous prime is 810881439439. The next prime is 810881439527. The reversal of 810881439461 is 164934188018.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 556657749025 + 254223690436 = 746095^2 + 504206^2 .

It is a cyclic number.

It is not a de Polignac number, because 810881439461 - 2¹⁸ = 810881177317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (810881439161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405440719730 + 405440719731.

It is an arithmetic number, because the mean of its divisors is an integer number (405440719731).

Almost surely, 2^810881439461 is an apocalyptic number.

It is an amenable number.

810881439461 is a deficient number, since it is larger than the sum of its proper divisors (1).

810881439461 is an equidigital number, since it uses as much as digits as its factorization.

810881439461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1327104, while the sum is 53.

The spelling of 810881439461 in words is "eight hundred ten billion, eight hundred eighty-one million, four hundred thirty-nine thousand, four hundred sixty-one".