999988523 has 2 divisors, whose sum is σ = 999988524. Its totient is φ = 999988522.

The previous prime is 999988519. The next prime is 999988541. The reversal of 999988523 is 325889999.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999988523 - 2² = 999988519 is a prime.

It is a super-2 number, since 2×999988523² = 1999954092263443058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999988513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499994261 + 499994262.

It is an arithmetic number, because the mean of its divisors is an integer number (499994262).

Almost surely, 2^999988523 is an apocalyptic number.

999988523 is a deficient number, since it is larger than the sum of its proper divisors (1).

999988523 is an equidigital number, since it uses as much as digits as its factorization.

999988523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12597120, while the sum is 62.

The square root of 999988523 is about 31622.5951338596. The cubic root of 999988523 is about 999.9961743187.

The spelling of 999988523 in words is "nine hundred ninety-nine million, nine hundred eighty-eight thousand, five hundred twenty-three".