1807981243 has 2 divisors, whose sum is σ = 1807981244. Its totient is φ = 1807981242.

The previous prime is 1807981237. The next prime is 1807981261. The reversal of 1807981243 is 3421897081.

It is a weak prime.

It is an emirp because it is prime and its reverse (3421897081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1807981243 - 2²⁵ = 1774426811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1807981243.

It is not a weakly prime, because it can be changed into another prime (1807982243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 903990621 + 903990622.

It is an arithmetic number, because the mean of its divisors is an integer number (903990622).

Almost surely, 2^1807981243 is an apocalyptic number.

1807981243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1807981243 is an equidigital number, since it uses as much as digits as its factorization.

1807981243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 1807981243 is about 42520.3626865999. The cubic root of 1807981243 is about 1218.2356569144.

The spelling of 1807981243 in words is "one billion, eight hundred seven million, nine hundred eighty-one thousand, two hundred forty-three".