861364238281 has 2 divisors, whose sum is σ = 861364238282. Its totient is φ = 861364238280.

The previous prime is 861364238269. The next prime is 861364238327. The reversal of 861364238281 is 182832463168.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 508190765625 + 353173472656 = 712875^2 + 594284^2 .

It is a cyclic number.

It is not a de Polignac number, because 861364238281 - 2¹¹ = 861364236233 is a prime.

It is a super-2 number, since 2×861364238281² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (861364238381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430682119140 + 430682119141.

It is an arithmetic number, because the mean of its divisors is an integer number (430682119141).

Almost surely, 2^861364238281 is an apocalyptic number.

It is an amenable number.

861364238281 is a deficient number, since it is larger than the sum of its proper divisors (1).

861364238281 is an equidigital number, since it uses as much as digits as its factorization.

861364238281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2654208, while the sum is 52.

The spelling of 861364238281 in words is "eight hundred sixty-one billion, three hundred sixty-four million, two hundred thirty-eight thousand, two hundred eighty-one".