1640101 has 4 divisors (see below), whose sum is σ = 1643212. Its totient is φ = 1636992.

The previous prime is 1640083. The next prime is 1640131. The reversal of 1640101 is 1010461.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1113025 + 527076 = 1055^2 + 726^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640101 - 2¹¹ = 1638053 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 546 + ... + 1891.

It is an arithmetic number, because the mean of its divisors is an integer number (410803).

2^1640101 is an apocalyptic number.

It is an amenable number.

1640101 is a deficient number, since it is larger than the sum of its proper divisors (3111).

1640101 is an equidigital number, since it uses as much as digits as its factorization.

1640101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1640101 is about 1280.6642807543. The cubic root of 1640101 is about 117.9297916165.

Adding to 1640101 its reverse (1010461), we get a palindrome (2650562).

The spelling of 1640101 in words is "one million, six hundred forty thousand, one hundred one".