1643937103 has 2 divisors, whose sum is σ = 1643937104. Its totient is φ = 1643937102.

The previous prime is 1643937091. The next prime is 1643937131. The reversal of 1643937103 is 3017393461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1643937103 - 2¹³ = 1643928911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1643937143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821968551 + 821968552.

It is an arithmetic number, because the mean of its divisors is an integer number (821968552).

Almost surely, 2^1643937103 is an apocalyptic number.

1643937103 is a deficient number, since it is larger than the sum of its proper divisors (1).

1643937103 is an equidigital number, since it uses as much as digits as its factorization.

1643937103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 1643937103 is about 40545.4942379545. The cubic root of 1643937103 is about 1180.2166371856.

The spelling of 1643937103 in words is "one billion, six hundred forty-three million, nine hundred thirty-seven thousand, one hundred three".