189641406881 has 4 divisors (see below), whose sum is σ = 189650386500. Its totient is φ = 189632427264.

The previous prime is 189641406869. The next prime is 189641406883. The reversal of 189641406881 is 188604146981.

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 188134725025 + 1506681856 = 433745^2 + 38816^2 .

It is a cyclic number.

It is not a de Polignac number, because 189641406881 - 2⁶ = 189641406817 is a prime.

It is a super-2 number, since 2×189641406881² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189641406883) 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, 4458056 + ... + 4500393.

It is an arithmetic number, because the mean of its divisors is an integer number (47412596625).

Almost surely, 2^189641406881 is an apocalyptic number.

It is an amenable number.

189641406881 is a deficient number, since it is larger than the sum of its proper divisors (8979619).

189641406881 is an equidigital number, since it uses as much as digits as its factorization.

189641406881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8979618.

The product of its (nonzero) digits is 2654208, while the sum is 56.

The spelling of 189641406881 in words is "one hundred eighty-nine billion, six hundred forty-one million, four hundred six thousand, eight hundred eighty-one".