1649551941 has 6 divisors (see below), whose sum is σ = 2382686150. Its totient is φ = 1099701288.

The previous prime is 1649551919. The next prime is 1649551961. The reversal of 1649551941 is 1491559461.

1649551941 is a `hidden beast` number, since 1 + 6 + 4 + 9 + 551 + 94 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 905408100 + 744143841 = 30090^2 + 27279^2 .

It is not a de Polignac number, because 1649551941 - 2¹⁴ = 1649535557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649551961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91641766 + ... + 91641783.

Almost surely, 2^1649551941 is an apocalyptic number.

It is an amenable number.

1649551941 is a deficient number, since it is larger than the sum of its proper divisors (733134209).

1649551941 is a wasteful number, since it uses less digits than its factorization.

1649551941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183283555 (or 183283552 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 1649551941 is about 40614.6764236772. The cubic root of 1649551941 is about 1181.5587799813.

The spelling of 1649551941 in words is "one billion, six hundred forty-nine million, five hundred fifty-one thousand, nine hundred forty-one".