1640341521 has 48 divisors (see below), whose sum is σ = 2938615680. Its totient is φ = 858574080.

The previous prime is 1640341519. The next prime is 1640341537. The reversal of 1640341521 is 1251430461.

It is a happy number.

1640341521 is a `hidden beast` number, since 1 + 640 + 3 + 4 + 15 + 2 + 1 = 666.

It is not a de Polignac number, because 1640341521 - 2¹ = 1640341519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640341121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99645 + ... + 114933.

It is an arithmetic number, because the mean of its divisors is an integer number (61221160).

Almost surely, 2^1640341521 is an apocalyptic number.

It is an amenable number.

1640341521 is a deficient number, since it is larger than the sum of its proper divisors (1298274159).

1640341521 is a wasteful number, since it uses less digits than its factorization.

1640341521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15446 (or 15443 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1640341521 is about 40501.1298731282. The cubic root of 1640341521 is about 1179.3555614052.

Adding to 1640341521 its reverse (1251430461), we get a palindrome (2891771982).

The spelling of 1640341521 in words is "one billion, six hundred forty million, three hundred forty-one thousand, five hundred twenty-one".