2531789043869 has 2 divisors, whose sum is σ = 2531789043870. Its totient is φ = 2531789043868.

The previous prime is 2531789043851. The next prime is 2531789043877. The reversal of 2531789043869 is 9683409871352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2144672380900 + 387116662969 = 1464470^2 + 622187^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531789043869 - 2²⁰ = 2531787995293 is a prime.

It is a super-2 number, since 2×2531789043869² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2531789043829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1265894521934 + 1265894521935.

It is an arithmetic number, because the mean of its divisors is an integer number (1265894521935).

It is a 1-persistent number, because it is pandigital, but 2⋅2531789043869 = 5063578087738 is not.

Almost surely, 2^{2531789043869} is an apocalyptic number.

It is an amenable number.

2531789043869 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531789043869 is an equidigital number, since it uses as much as digits as its factorization.

2531789043869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 78382080, while the sum is 65.

The spelling of 2531789043869 in words is "two trillion, five hundred thirty-one billion, seven hundred eighty-nine million, forty-three thousand, eight hundred sixty-nine".