1812019507169 has 2 divisors, whose sum is σ = 1812019507170. Its totient is φ = 1812019507168.

The previous prime is 1812019507163. The next prime is 1812019507201. The reversal of 1812019507169 is 9617059102181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1223262544144 + 588756963025 = 1106012^2 + 767305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1812019507169 - 2⁴ = 1812019507153 is a prime.

It is a super-2 number, since 2×1812019507169² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1812019507163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906009753584 + 906009753585.

It is an arithmetic number, because the mean of its divisors is an integer number (906009753585).

Almost surely, 2^{1812019507169} is an apocalyptic number.

It is an amenable number.

1812019507169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812019507169 is an equidigital number, since it uses as much as digits as its factorization.

1812019507169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 50.

The spelling of 1812019507169 in words is "one trillion, eight hundred twelve billion, nineteen million, five hundred seven thousand, one hundred sixty-nine".