2099931 has 8 divisors (see below), whose sum is σ = 2810640.
Its totient is φ = 1394592.
The previous prime is 2099927. The next prime is 2099939. The reversal of 2099931 is 1399902.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 2099931 - 22 = 2099927 is a prime.
It is a super-2 number, since 2×20999312 = 8819420409522, which contains 22 as substring.
It is a junction number, because it is equal to n+sod(n) for n = 2099892 and 2099901.
It is not an unprimeable number, because it can be changed into a prime (2099939) 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, 316 + ... + 2073.
It is an arithmetic number, because the mean of its divisors is an integer number (351330).
22099931 is an apocalyptic number.
2099931 is the 917-th centered pentagonal number.
2099931 is a deficient number, since it is larger than the sum of its proper divisors (710709).
2099931 is a wasteful number, since it uses less digits than its factorization.
2099931 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2685.
The product of its (nonzero) digits is 4374, while the sum is 33.
The square root of 2099931 is about 1449.1138671616.
The cubic root of 2099931 is about 128.0565139443.
The spelling of 2099931 in words is "two million, ninety-nine thousand, nine hundred thirty-one".