1643002423 has 2 divisors, whose sum is σ = 1643002424. Its totient is φ = 1643002422.

The previous prime is 1643002411. The next prime is 1643002457. The reversal of 1643002423 is 3242003461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1643002423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643002483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821501211 + 821501212.

It is an arithmetic number, because the mean of its divisors is an integer number (821501212).

Almost surely, 2^1643002423 is an apocalyptic number.

1643002423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643002423 is an equidigital number, since it uses as much as digits as its factorization.

1643002423 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 1643002423 is about 40533.9662875470. The cubic root of 1643002423 is about 1179.9929193772.

Adding to 1643002423 its reverse (3242003461), we get a palindrome (4885005884).

The spelling of 1643002423 in words is "one billion, six hundred forty-three million, two thousand, four hundred twenty-three".