1872426111217 has 2 divisors, whose sum is σ = 1872426111218. Its totient is φ = 1872426111216.

The previous prime is 1872426111211. The next prime is 1872426111271. The reversal of 1872426111217 is 7121116242781.

Together with next prime (1872426111271) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1784171961441 + 88254149776 = 1335729^2 + 297076^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872426111217 - 2³ = 1872426111209 is a prime.

It is not a weakly prime, because it can be changed into another prime (1872426111211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936213055608 + 936213055609.

It is an arithmetic number, because the mean of its divisors is an integer number (936213055609).

Almost surely, 2^{1872426111217} is an apocalyptic number.

It is an amenable number.

1872426111217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872426111217 is an equidigital number, since it uses as much as digits as its factorization.

1872426111217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 43.

The spelling of 1872426111217 in words is "one trillion, eight hundred seventy-two billion, four hundred twenty-six million, one hundred eleven thousand, two hundred seventeen".