1820525243 has 2 divisors, whose sum is σ = 1820525244. Its totient is φ = 1820525242.

The previous prime is 1820525227. The next prime is 1820525293. The reversal of 1820525243 is 3425250281.

It is a weak prime.

It is an emirp because it is prime and its reverse (3425250281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1820525243 - 2⁴ = 1820525227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1820525293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910262621 + 910262622.

It is an arithmetic number, because the mean of its divisors is an integer number (910262622).

Almost surely, 2^1820525243 is an apocalyptic number.

1820525243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820525243 is an equidigital number, since it uses as much as digits as its factorization.

1820525243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 1820525243 is about 42667.6135142335. The cubic root of 1820525243 is about 1221.0465898217.

The spelling of 1820525243 in words is "one billion, eight hundred twenty million, five hundred twenty-five thousand, two hundred forty-three".