1640621311 has 8 divisors (see below), whose sum is σ = 1876895744. Its totient is φ = 1404821880.

The previous prime is 1640621293. The next prime is 1640621351. The reversal of 1640621311 is 1131260461.

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

It is not a de Polignac number, because 1640621311 - 2¹³ = 1640613119 is a prime.

It is a super-2 number, since 2×1640621311² = 5383276572214717442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640621351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111315 + ... + 125188.

It is an arithmetic number, because the mean of its divisors is an integer number (234611968).

Almost surely, 2^1640621311 is an apocalyptic number.

1640621311 is a deficient number, since it is larger than the sum of its proper divisors (236274433).

1640621311 is an equidigital number, since it uses as much as digits as its factorization.

1640621311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237501.

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

The square root of 1640621311 is about 40504.5838270189. The cubic root of 1640621311 is about 1179.4226110875.

Adding to 1640621311 its reverse (1131260461), we get a palindrome (2771881772).

The spelling of 1640621311 in words is "one billion, six hundred forty million, six hundred twenty-one thousand, three hundred eleven".