1649112649 has 4 divisors (see below), whose sum is σ = 1680228036. Its totient is φ = 1617997264.

The previous prime is 1649112629. The next prime is 1649112677. The reversal of 1649112649 is 9462119461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1034072649 + 615040000 = 32157^2 + 24800^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649112649 - 2⁹ = 1649112137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1649112629) 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, 15557614 + ... + 15557719.

It is an arithmetic number, because the mean of its divisors is an integer number (420057009).

Almost surely, 2^1649112649 is an apocalyptic number.

It is an amenable number.

1649112649 is a deficient number, since it is larger than the sum of its proper divisors (31115387).

1649112649 is an equidigital number, since it uses as much as digits as its factorization.

1649112649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31115386.

The product of its digits is 93312, while the sum is 43.

The square root of 1649112649 is about 40609.2680185201. The cubic root of 1649112649 is about 1181.4538837386.

The spelling of 1649112649 in words is "one billion, six hundred forty-nine million, one hundred twelve thousand, six hundred forty-nine".