1640219123 has 2 divisors, whose sum is σ = 1640219124. Its totient is φ = 1640219122.

The previous prime is 1640219117. The next prime is 1640219129. The reversal of 1640219123 is 3219120461.

It is a balanced prime because it is at equal distance from previous prime (1640219117) and next prime (1640219129).

It is a cyclic number.

It is not a de Polignac number, because 1640219123 - 2⁶ = 1640219059 is a prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (1640219129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820109561 + 820109562.

It is an arithmetic number, because the mean of its divisors is an integer number (820109562).

Almost surely, 2^1640219123 is an apocalyptic number.

1640219123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640219123 is an equidigital number, since it uses as much as digits as its factorization.

1640219123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1640219123 is about 40499.6188006751. The cubic root of 1640219123 is about 1179.3262271983.

Adding to 1640219123 its reverse (3219120461), we get a palindrome (4859339584).

The spelling of 1640219123 in words is "one billion, six hundred forty million, two hundred nineteen thousand, one hundred twenty-three".