1643141623 has 2 divisors, whose sum is σ = 1643141624. Its totient is φ = 1643141622.

The previous prime is 1643141609. The next prime is 1643141651. The reversal of 1643141623 is 3261413461.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (3261413461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1643141623 - 2⁹ = 1643141111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643141663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821570811 + 821570812.

It is an arithmetic number, because the mean of its divisors is an integer number (821570812).

Almost surely, 2^1643141623 is an apocalyptic number.

1643141623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643141623 is an equidigital number, since it uses as much as digits as its factorization.

1643141623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 1643141623 is about 40535.6833296295. The cubic root of 1643141623 is about 1180.0262425936.

The spelling of 1643141623 in words is "one billion, six hundred forty-three million, one hundred forty-one thousand, six hundred twenty-three".