1861124772229 has 2 divisors, whose sum is σ = 1861124772230. Its totient is φ = 1861124772228.

The previous prime is 1861124772197. The next prime is 1861124772233. The reversal of 1861124772229 is 9222774211681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1781077084900 + 80047687329 = 1334570^2 + 282927^2 .

It is a cyclic number.

It is not a de Polignac number, because 1861124772229 - 2⁵ = 1861124772197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861124772329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930562386114 + 930562386115.

It is an arithmetic number, because the mean of its divisors is an integer number (930562386115).

Almost surely, 2^{1861124772229} is an apocalyptic number.

It is an amenable number.

1861124772229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861124772229 is an equidigital number, since it uses as much as digits as its factorization.

1861124772229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 52.

The spelling of 1861124772229 in words is "one trillion, eight hundred sixty-one billion, one hundred twenty-four million, seven hundred seventy-two thousand, two hundred twenty-nine".