189029029081 has 4 divisors (see below), whose sum is σ = 189084809700. Its totient is φ = 188973248464.

The previous prime is 189029029037. The next prime is 189029029087. The reversal of 189029029081 is 180920920981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 180920920981 = 149 ⋅1214234369.

It can be written as a sum of positive squares in 2 ways, for example, as 177817395856 + 11211633225 = 421684^2 + 105885^2 .

It is a cyclic number.

It is not a de Polignac number, because 189029029081 - 2⁷ = 189029028953 is a prime.

It is a super-2 number, since 2×189029029081² (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 (189029029087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27885226 + ... + 27892003.

It is an arithmetic number, because the mean of its divisors is an integer number (47271202425).

Almost surely, 2^189029029081 is an apocalyptic number.

It is an amenable number.

189029029081 is a deficient number, since it is larger than the sum of its proper divisors (55780619).

189029029081 is an equidigital number, since it uses as much as digits as its factorization.

189029029081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55780618.

The product of its (nonzero) digits is 186624, while the sum is 49.

The spelling of 189029029081 in words is "one hundred eighty-nine billion, twenty-nine million, twenty-nine thousand, eighty-one".