189973067881 has 3 divisors (see below), whose sum is σ = 189973503741. Its totient is φ = 189972632022.

The previous prime is 189973067863. The next prime is 189973067897. The reversal of 189973067881 is 188760379981.

The square root of 189973067881 is 435859.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 188760379981 = 16301 ⋅11579681.

It is not a de Polignac number, because 189973067881 - 2⁹ = 189973067369 is a prime.

It is a super-2 number, since 2×189973067881² (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 (189973067281) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 217930 + ... + 653788.

It is an arithmetic number, because the mean of its divisors is an integer number (63324501247).

Almost surely, 2^189973067881 is an apocalyptic number.

189973067881 is the 435859-th square number.

189973067881 is the 217930-th centered octagonal number.

It is an amenable number.

189973067881 is a deficient number, since it is larger than the sum of its proper divisors (435860).

189973067881 is an frugal number, since it uses more digits than its factorization.

189973067881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871718 (or 435859 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 67.

The spelling of 189973067881 in words is "one hundred eighty-nine billion, nine hundred seventy-three million, sixty-seven thousand, eight hundred eighty-one".