999869597 has 2 divisors, whose sum is σ = 999869598. Its totient is φ = 999869596.

The previous prime is 999869579. The next prime is 999869617. The reversal of 999869597 is 795968999.

Together with previous prime (999869579) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 677092441 + 322777156 = 26021^2 + 17966^2 .

It is a cyclic number.

It is not a de Polignac number, because 999869597 - 2¹² = 999865501 is a prime.

It is a super-2 number, since 2×999869597² = 1999478422009884818, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 999869597.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999869557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499934798 + 499934799.

It is an arithmetic number, because the mean of its divisors is an integer number (499934799).

Almost surely, 2^999869597 is an apocalyptic number.

It is an amenable number.

999869597 is a deficient number, since it is larger than the sum of its proper divisors (1).

999869597 is an equidigital number, since it uses as much as digits as its factorization.

999869597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 99202320, while the sum is 71.

The square root of 999869597 is about 31620.7146819929. The cubic root of 999869597 is about 999.9565304438.

The spelling of 999869597 in words is "nine hundred ninety-nine million, eight hundred sixty-nine thousand, five hundred ninety-seven".