189581868101 has 4 divisors (see below), whose sum is σ = 194705702412. Its totient is φ = 184458033792.

The previous prime is 189581868067. The next prime is 189581868103. The reversal of 189581868101 is 101868185981.

It is a Cunningham number, because it is equal to 435410²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 169640191876 + 19941676225 = 411874^2 + 141215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189581868101 is a prime.

It is a super-3 number, since 3×189581868101³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189581868103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2561917100 + ... + 2561917173.

It is an arithmetic number, because the mean of its divisors is an integer number (48676425603).

Almost surely, 2^189581868101 is an apocalyptic number.

It is an amenable number.

189581868101 is a deficient number, since it is larger than the sum of its proper divisors (5123834311).

189581868101 is an equidigital number, since it uses as much as digits as its factorization.

189581868101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5123834310.

The product of its (nonzero) digits is 1105920, while the sum is 56.

The spelling of 189581868101 in words is "one hundred eighty-nine billion, five hundred eighty-one million, eight hundred sixty-eight thousand, one hundred one".