1649649533 has 6 divisors (see below), whose sum is σ = 1918980126. Its totient is φ = 1413985272.

The previous prime is 1649649523. The next prime is 1649649541. The reversal of 1649649533 is 3359469461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 845530084 + 804119449 = 29078^2 + 28357^2 .

It is not a de Polignac number, because 1649649533 - 2⁴ = 1649649517 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649649523) 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, 16833110 + ... + 16833207.

It is an arithmetic number, because the mean of its divisors is an integer number (319830021).

Almost surely, 2^1649649533 is an apocalyptic number.

It is an amenable number.

1649649533 is a deficient number, since it is larger than the sum of its proper divisors (269330593).

1649649533 is an equidigital number, since it uses as much as digits as its factorization.

1649649533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33666331 (or 33666324 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 50.

The square root of 1649649533 is about 40615.8778435232. The cubic root of 1649649533 is about 1181.5820809371.

The spelling of 1649649533 in words is "one billion, six hundred forty-nine million, six hundred forty-nine thousand, five hundred thirty-three".