1649208049 has 4 divisors (see below), whose sum is σ = 1680325236. Its totient is φ = 1618090864.

The previous prime is 1649208007. The next prime is 1649208059. The reversal of 1649208049 is 9408029461.

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 1293697024 + 355511025 = 35968^2 + 18855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1649208049 - 2²¹ = 1647110897 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1649207996 and 1649208014.

It is not an unprimeable number, because it can be changed into a prime (1649208059) 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, 15558514 + ... + 15558619.

It is an arithmetic number, because the mean of its divisors is an integer number (420081309).

Almost surely, 2^1649208049 is an apocalyptic number.

It is an amenable number.

1649208049 is a deficient number, since it is larger than the sum of its proper divisors (31117187).

1649208049 is an equidigital number, since it uses as much as digits as its factorization.

1649208049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31117186.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 1649208049 is about 40610.4426102450. The cubic root of 1649208049 is about 1181.4766653898.

The spelling of 1649208049 in words is "one billion, six hundred forty-nine million, two hundred eight thousand, forty-nine".