187819801885129 has 2 divisors, whose sum is σ = 187819801885130. Its totient is φ = 187819801885128.

The previous prime is 187819801885123. The next prime is 187819801885207. The reversal of 187819801885129 is 921588108918781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 139339775067529 + 48480026817600 = 11804227^2 + 6962760^2 .

It is a cyclic number.

It is not a de Polignac number, because 187819801885129 - 2²⁵ = 187819768330697 is a prime.

It is a super-2 number, since 2×187819801885129² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (187819801885123) 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, 93909900942564 + 93909900942565.

It is an arithmetic number, because the mean of its divisors is an integer number (93909900942565).

Almost surely, 2^{187819801885129} is an apocalyptic number.

It is an amenable number.

187819801885129 is a deficient number, since it is larger than the sum of its proper divisors (1).

187819801885129 is an equidigital number, since it uses as much as digits as its factorization.

187819801885129 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185794560, while the sum is 76.

The spelling of 187819801885129 in words is "one hundred eighty-seven trillion, eight hundred nineteen billion, eight hundred one million, eight hundred eighty-five thousand, one hundred twenty-nine".