1646242849 has 4 divisors (see below), whose sum is σ = 1669429440. Its totient is φ = 1623056260.

The previous prime is 1646242847. The next prime is 1646242861. The reversal of 1646242849 is 9482426461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9482426461 = 3499 ⋅2710039.

It is a cyclic number.

It is not a de Polignac number, because 1646242849 - 2¹ = 1646242847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1646242799 and 1646242808.

It is not an unprimeable number, because it can be changed into a prime (1646242847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11593189 + ... + 11593330.

It is an arithmetic number, because the mean of its divisors is an integer number (417357360).

Almost surely, 2^1646242849 is an apocalyptic number.

It is an amenable number.

1646242849 is a deficient number, since it is larger than the sum of its proper divisors (23186591).

1646242849 is an equidigital number, since it uses as much as digits as its factorization.

1646242849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23186590.

The product of its digits is 663552, while the sum is 46.

The square root of 1646242849 is about 40573.9183343192. The cubic root of 1646242849 is about 1180.7681604178.

The spelling of 1646242849 in words is "one billion, six hundred forty-six million, two hundred forty-two thousand, eight hundred forty-nine".