1645346243 has 2 divisors, whose sum is σ = 1645346244. Its totient is φ = 1645346242.

The previous prime is 1645346237. The next prime is 1645346321. The reversal of 1645346243 is 3426435461.

It is a weak prime.

It is an emirp because it is prime and its reverse (3426435461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1645346243 - 2⁶ = 1645346179 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1645346197 and 1645346206.

It is not a weakly prime, because it can be changed into another prime (1645346543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822673121 + 822673122.

It is an arithmetic number, because the mean of its divisors is an integer number (822673122).

Almost surely, 2^1645346243 is an apocalyptic number.

1645346243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645346243 is an equidigital number, since it uses as much as digits as its factorization.

1645346243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 38.

The square root of 1645346243 is about 40562.8677856978. The cubic root of 1645346243 is about 1180.5537578515.

The spelling of 1645346243 in words is "one billion, six hundred forty-five million, three hundred forty-six thousand, two hundred forty-three".