869400554847581 has 2 divisors, whose sum is σ = 869400554847582. Its totient is φ = 869400554847580.

The previous prime is 869400554847563. The next prime is 869400554847589. The reversal of 869400554847581 is 185748455004968.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 474412396620100 + 394988158227481 = 21781010^2 + 19874309^2 .

It is a cyclic number.

It is not a de Polignac number, because 869400554847581 - 2¹⁴ = 869400554831197 is a prime.

It is a super-2 number, since 2×869400554847581² (a number of 31 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 869400554847499 and 869400554847508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869400554847589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434700277423790 + 434700277423791.

It is an arithmetic number, because the mean of its divisors is an integer number (434700277423791).

Almost surely, 2^{869400554847581} is an apocalyptic number.

It is an amenable number.

869400554847581 is a deficient number, since it is larger than the sum of its proper divisors (1).

869400554847581 is an equidigital number, since it uses as much as digits as its factorization.

869400554847581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1548288000, while the sum is 74.

The spelling of 869400554847581 in words is "eight hundred sixty-nine trillion, four hundred billion, five hundred fifty-four million, eight hundred forty-seven thousand, five hundred eighty-one".