1649137869 has 12 divisors (see below), whose sum is σ = 2388312576. Its totient is φ = 1096552392.

The previous prime is 1649137829. The next prime is 1649137883. The reversal of 1649137869 is 9687319461.

1649137869 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1649137869 - 2⁷ = 1649137741 is a prime.

It is a super-2 number, since 2×1649137869² = 5439311421939722322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649137829) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235767 + ... + 242660.

It is an arithmetic number, because the mean of its divisors is an integer number (199026048).

Almost surely, 2^1649137869 is an apocalyptic number.

It is an amenable number.

1649137869 is a deficient number, since it is larger than the sum of its proper divisors (739174707).

1649137869 is a wasteful number, since it uses less digits than its factorization.

1649137869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478816 (or 478813 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The square root of 1649137869 is about 40609.5785375815. The cubic root of 1649137869 is about 1181.4599063947.

The spelling of 1649137869 in words is "one billion, six hundred forty-nine million, one hundred thirty-seven thousand, eight hundred sixty-nine".