999529555081 has 2 divisors, whose sum is σ = 999529555082. Its totient is φ = 999529555080.

The previous prime is 999529555069. The next prime is 999529555103. The reversal of 999529555081 is 180555925999.

999529555081 = T₈₁₆₃₀₃ + T₈₁₆₃₀₄ + T₈₁₆₃₀₅.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 680823014400 + 318706540681 = 825120^2 + 564541^2 .

It is a cyclic number.

It is not a de Polignac number, because 999529555081 - 2¹³ = 999529546889 is a prime.

It is a super-2 number, since 2×999529555081² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 999529554998 and 999529555016.

It is not a weakly prime, because it can be changed into another prime (999529555051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499764777540 + 499764777541.

It is an arithmetic number, because the mean of its divisors is an integer number (499764777541).

Almost surely, 2^999529555081 is an apocalyptic number.

999529555081 is the 816305-th centered triangular number.

It is an amenable number.

999529555081 is a deficient number, since it is larger than the sum of its proper divisors (1).

999529555081 is an equidigital number, since it uses as much as digits as its factorization.

999529555081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610000, while the sum is 67.

The spelling of 999529555081 in words is "nine hundred ninety-nine billion, five hundred twenty-nine million, five hundred fifty-five thousand, eighty-one".