999688925189 has 2 divisors, whose sum is σ = 999688925190. Its totient is φ = 999688925188.

The previous prime is 999688925093. The next prime is 999688925201. The reversal of 999688925189 is 981529886999.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 894978437089 + 104710488100 = 946033^2 + 323590^2 .

It is a cyclic number.

It is not a de Polignac number, because 999688925189 - 2³² = 995393957893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999688955189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499844462594 + 499844462595.

It is an arithmetic number, because the mean of its divisors is an integer number (499844462595).

Almost surely, 2^999688925189 is an apocalyptic number.

It is an amenable number.

999688925189 is a deficient number, since it is larger than the sum of its proper divisors (1).

999688925189 is an equidigital number, since it uses as much as digits as its factorization.

999688925189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1813985280, while the sum is 83.

The spelling of 999688925189 in words is "nine hundred ninety-nine billion, six hundred eighty-eight million, nine hundred twenty-five thousand, one hundred eighty-nine".