861250490369 has 2 divisors, whose sum is σ = 861250490370. Its totient is φ = 861250490368.

The previous prime is 861250490357. The next prime is 861250490437. The reversal of 861250490369 is 963094052168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 847988664769 + 13261825600 = 920863^2 + 115160^2 .

It is a cyclic number.

It is not a de Polignac number, because 861250490369 - 2²⁸ = 860982054913 is a prime.

It is a super-2 number, since 2×861250490369² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 861250490369.

It is not a weakly prime, because it can be changed into another prime (861250490329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430625245184 + 430625245185.

It is an arithmetic number, because the mean of its divisors is an integer number (430625245185).

Almost surely, 2^861250490369 is an apocalyptic number.

It is an amenable number.

861250490369 is a deficient number, since it is larger than the sum of its proper divisors (1).

861250490369 is an equidigital number, since it uses as much as digits as its factorization.

861250490369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 861250490369 in words is "eight hundred sixty-one billion, two hundred fifty million, four hundred ninety thousand, three hundred sixty-nine".