1649263205 has 8 divisors (see below), whose sum is σ = 2047361400. Its totient is φ = 1273913536.

The previous prime is 1649263199. The next prime is 1649263207. The reversal of 1649263205 is 5023629461.

It can be written as a sum of positive squares in 4 ways, for example, as 491154244 + 1158108961 = 22162^2 + 34031^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1649263205 - 2¹⁸ = 1649001061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1649263207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5686970 + ... + 5687259.

It is an arithmetic number, because the mean of its divisors is an integer number (255920175).

Almost surely, 2^1649263205 is an apocalyptic number.

It is an amenable number.

1649263205 is a deficient number, since it is larger than the sum of its proper divisors (398098195).

1649263205 is a wasteful number, since it uses less digits than its factorization.

1649263205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11374263.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 1649263205 is about 40611.1216909851. The cubic root of 1649263205 is about 1181.4898363176.

It can be divided in two parts, 16492 and 63205, that added together give a palindrome (79697).

The spelling of 1649263205 in words is "one billion, six hundred forty-nine million, two hundred sixty-three thousand, two hundred five".