1640121316 has 12 divisors (see below), whose sum is σ = 2871994300. Its totient is φ = 819551520.

The previous prime is 1640121289. The next prime is 1640121317. The reversal of 1640121316 is 6131210461.

It can be written as a sum of positive squares in 2 ways, for example, as 988850916 + 651270400 = 31446^2 + 25520^2 .

It is not an unprimeable number, because it can be changed into a prime (1640121317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119991 + ... + 132958.

Almost surely, 2^1640121316 is an apocalyptic number.

It is an amenable number.

1640121316 is a deficient number, since it is larger than the sum of its proper divisors (1231872984).

1640121316 is a wasteful number, since it uses less digits than its factorization.

1640121316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254574 (or 254572 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1640121316 is about 40498.4112774810. The cubic root of 1640121316 is about 1179.3027854822.

Adding to 1640121316 its reverse (6131210461), we get a palindrome (7771331777).

The spelling of 1640121316 in words is "one billion, six hundred forty million, one hundred twenty-one thousand, three hundred sixteen".