1640312011 has 8 divisors (see below), whose sum is σ = 1775741184. Its totient is φ = 1506204480.

The previous prime is 1640311973. The next prime is 1640312027. The reversal of 1640312011 is 1102130461.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1640312011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1640312011.

It is not an unprimeable number, because it can be changed into a prime (1640312411) 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, 327826 + ... + 332791.

It is an arithmetic number, because the mean of its divisors is an integer number (221967648).

Almost surely, 2^1640312011 is an apocalyptic number.

1640312011 is a deficient number, since it is larger than the sum of its proper divisors (135429173).

1640312011 is a wasteful number, since it uses less digits than its factorization.

1640312011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660821.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1640312011 is about 40500.7655606656. The cubic root of 1640312011 is about 1179.3484890992.

Adding to 1640312011 its reverse (1102130461), we get a palindrome (2742442472).

The spelling of 1640312011 in words is "one billion, six hundred forty million, three hundred twelve thousand, eleven".