2231816781473 has 2 divisors, whose sum is σ = 2231816781474. Its totient is φ = 2231816781472.

The previous prime is 2231816781463. The next prime is 2231816781559. The reversal of 2231816781473 is 3741876181322.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1780001583889 + 451815197584 = 1334167^2 + 672172^2 .

It is a cyclic number.

It is not a de Polignac number, because 2231816781473 - 2¹⁸ = 2231816519329 is a prime.

It is a super-3 number, since 3×2231816781473³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (2231816781463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1115908390736 + 1115908390737.

It is an arithmetic number, because the mean of its divisors is an integer number (1115908390737).

Almost surely, 2^{2231816781473} is an apocalyptic number.

It is an amenable number.

2231816781473 is a deficient number, since it is larger than the sum of its proper divisors (1).

2231816781473 is an equidigital number, since it uses as much as digits as its factorization.

2231816781473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 53.

The spelling of 2231816781473 in words is "two trillion, two hundred thirty-one billion, eight hundred sixteen million, seven hundred eighty-one thousand, four hundred seventy-three".