189244877897 has 4 divisors (see below), whose sum is σ = 200376929556. Its totient is φ = 178112826240.

The previous prime is 189244877743. The next prime is 189244877951. The reversal of 189244877897 is 798778442981.

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 170295703561 + 18949174336 = 412669^2 + 137656^2 .

It is a cyclic number.

It is not a de Polignac number, because 189244877897 - 2¹⁸ = 189244615753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189244876897) 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, 5566025804 + ... + 5566025837.

It is an arithmetic number, because the mean of its divisors is an integer number (50094232389).

Almost surely, 2^189244877897 is an apocalyptic number.

189244877897 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

189244877897 is a deficient number, since it is larger than the sum of its proper divisors (11132051659).

189244877897 is a wasteful number, since it uses less digits than its factorization.

189244877897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11132051658.

The product of its digits is 455196672, while the sum is 74.

The spelling of 189244877897 in words is "one hundred eighty-nine billion, two hundred forty-four million, eight hundred seventy-seven thousand, eight hundred ninety-seven".