1640533121 has 16 divisors (see below), whose sum is σ = 1761254400. Its totient is φ = 1524080448.

The previous prime is 1640533117. The next prime is 1640533127. The reversal of 1640533121 is 1213350461.

It is a cyclic number.

It is not a de Polignac number, because 1640533121 - 2² = 1640533117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640533127) 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 15 ways as a sum of consecutive naturals, for example, 602000 + ... + 604718.

It is an arithmetic number, because the mean of its divisors is an integer number (110078400).

Almost surely, 2^1640533121 is an apocalyptic number.

It is an amenable number.

1640533121 is a deficient number, since it is larger than the sum of its proper divisors (120721279).

1640533121 is a wasteful number, since it uses less digits than its factorization.

1640533121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3488.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1640533121 is about 40503.4951701702. The cubic root of 1640533121 is about 1179.4014778044.

Adding to 1640533121 its reverse (1213350461), we get a palindrome (2853883582).

The spelling of 1640533121 in words is "one billion, six hundred forty million, five hundred thirty-three thousand, one hundred twenty-one".