990124109 has 8 divisors (see below), whose sum is σ = 1076846232. Its totient is φ = 904910400.

The previous prime is 990124099. The next prime is 990124117. The reversal of 990124109 is 901421099.

It can be written as a sum of positive squares in 4 ways, for example, as 218951209 + 771172900 = 14797^2 + 27770^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990124109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990124189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 375734 + ... + 378359.

It is an arithmetic number, because the mean of its divisors is an integer number (134605779).

Almost surely, 2^990124109 is an apocalyptic number.

It is an amenable number.

990124109 is a deficient number, since it is larger than the sum of its proper divisors (86722123).

990124109 is a wasteful number, since it uses less digits than its factorization.

990124109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754207.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 990124109 is about 31466.2376047725. The cubic root of 990124109 is about 996.6971394557.

The spelling of 990124109 in words is "nine hundred ninety million, one hundred twenty-four thousand, one hundred nine".