1640111 has 4 divisors (see below), whose sum is σ = 1789224. Its totient is φ = 1491000.

The previous prime is 1640083. The next prime is 1640131. The reversal of 1640111 is 1110461.

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

It is a cyclic number.

It is not a de Polignac number, because 1640111 - 2¹⁰ = 1639087 is a prime.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74540 + ... + 74561.

It is an arithmetic number, because the mean of its divisors is an integer number (447306).

2^1640111 is an apocalyptic number.

1640111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1640111 is a deficient number, since it is larger than the sum of its proper divisors (149113).

1640111 is a wasteful number, since it uses less digits than its factorization.

1640111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149112.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 1640111 is about 1280.6681849722. The cubic root of 1640111 is about 117.9300312959.

Adding to 1640111 its reverse (1110461), we get a palindrome (2750572).

The spelling of 1640111 in words is "one million, six hundred forty thousand, one hundred eleven".