998991125 has 36 divisors (see below), whose sum is σ = 1375737636. Its totient is φ = 723712000.

The previous prime is 998991121. The next prime is 998991167. The reversal of 998991125 is 521199899.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 6 ways, for example, as 3020644 + 995970481 = 1738^2 + 31559^2 .

It is not a de Polignac number, because 998991125 - 2² = 998991121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998991121) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3886997 + ... + 3887253.

Almost surely, 2^998991125 is an apocalyptic number.

It is an amenable number.

998991125 is a deficient number, since it is larger than the sum of its proper divisors (376746511).

998991125 is an equidigital number, since it uses as much as digits as its factorization.

998991125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551 (or 273 counting only the distinct ones).

The product of its digits is 524880, while the sum is 53.

The square root of 998991125 is about 31606.8208619595. The cubic root of 998991125 is about 999.6635951778.

Multiplying 998991125 by its product of digits (524880), we get a square (524350461690000 = 22898700²).

The spelling of 998991125 in words is "nine hundred ninety-eight million, nine hundred ninety-one thousand, one hundred twenty-five".