1900011028181 has 12 divisors (see below), whose sum is σ = 2210748832908. Its totient is φ = 1628188938432.

The previous prime is 1900011028171. The next prime is 1900011028213. The reversal of 1900011028181 is 1818201100091.

It can be written as a sum of positive squares in 2 ways, for example, as 790694424100 + 1109316604081 = 889210^2 + 1053241^2 .

It is not a de Polignac number, because 1900011028181 - 2³⁸ = 1625133121237 is a prime.

It is a super-2 number, since 2×1900011028181² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1900011028171) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4460216 + ... + 4867601.

It is an arithmetic number, because the mean of its divisors is an integer number (184229069409).

Almost surely, 2^{1900011028181} is an apocalyptic number.

It is an amenable number.

1900011028181 is a deficient number, since it is larger than the sum of its proper divisors (310737804727).

1900011028181 is an equidigital number, since it uses as much as digits as its factorization.

1900011028181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9331988 (or 9331981 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 32.

The spelling of 1900011028181 in words is "one trillion, nine hundred billion, eleven million, twenty-eight thousand, one hundred eighty-one".