4991846409 has 27 divisors (see below), whose sum is σ = 7929233767.
Its totient is φ = 3023948400.
The previous prime is 4991846407. The next prime is 4991846411. The reversal of 4991846409 is 9046481994.
It is a happy number.
The square root of 4991846409 is 70653.
It is a perfect power (a square), and thus also a powerful number.
It is an interprime number because it is at equal distance from previous prime (4991846407) and next prime (4991846411).
It can be written as a sum of positive squares in only one way, i.e., 4761414009 + 230432400 = 69003^2 + 15180^2
It is not a de Polignac number, because 4991846409 - 21 = 4991846407 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (4991846401) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2330479 + ... + 2332619.
Almost surely, 24991846409 is an apocalyptic number.
4991846409 is the 70653-rd square number.
4991846409 is the 35327-th centered octagonal number.
It is an amenable number.
4991846409 is a deficient number, since it is larger than the sum of its proper divisors (2937387358).
4991846409 is an equidigital number, since it uses as much as digits as its factorization.
4991846409 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 4310 (or 2155 counting only the distinct ones).
The product of its (nonzero) digits is 2239488, while the sum is 54.
The cubic root of 4991846409 is about 1709.0459446704.
The spelling of 4991846409 in words is "four billion, nine hundred ninety-one million, eight hundred forty-six thousand, four hundred nine".