861531054481 has 2 divisors, whose sum is σ = 861531054482. Its totient is φ = 861531054480.

The previous prime is 861531054469. The next prime is 861531054493. The reversal of 861531054481 is 184450135168.

It is a balanced prime because it is at equal distance from previous prime (861531054469) and next prime (861531054493).

It can be written as a sum of positive squares in only one way, i.e., 709730427025 + 151800627456 = 842455^2 + 389616^2 .

It is a cyclic number.

It is not a de Polignac number, because 861531054481 - 2⁷ = 861531054353 is a prime.

It is a super-2 number, since 2×861531054481² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (861531057481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 430765527240 + 430765527241.

It is an arithmetic number, because the mean of its divisors is an integer number (430765527241).

Almost surely, 2^861531054481 is an apocalyptic number.

It is an amenable number.

861531054481 is a deficient number, since it is larger than the sum of its proper divisors (1).

861531054481 is an equidigital number, since it uses as much as digits as its factorization.

861531054481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 460800, while the sum is 46.

The spelling of 861531054481 in words is "eight hundred sixty-one billion, five hundred thirty-one million, fifty-four thousand, four hundred eighty-one".