1814189557 has 2 divisors, whose sum is σ = 1814189558. Its totient is φ = 1814189556.

The previous prime is 1814189551. The next prime is 1814189591. The reversal of 1814189557 is 7559814181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1731724996 + 82464561 = 41614^2 + 9081^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1814189557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1814189557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1814189551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 907094778 + 907094779.

It is an arithmetic number, because the mean of its divisors is an integer number (907094779).

Almost surely, 2^1814189557 is an apocalyptic number.

It is an amenable number.

1814189557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1814189557 is an equidigital number, since it uses as much as digits as its factorization.

1814189557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 403200, while the sum is 49.

The square root of 1814189557 is about 42593.3041333964. The cubic root of 1814189557 is about 1219.6284717033.

The spelling of 1814189557 in words is "one billion, eight hundred fourteen million, one hundred eighty-nine thousand, five hundred fifty-seven".