189679976981 has 8 divisors (see below), whose sum is σ = 207025719264. Its totient is φ = 172351252720.

The previous prime is 189679976963. The next prime is 189679976987.

189679976981 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189679976981 is a prime.

It is a super-2 number, since 2×189679976981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189679976896 and 189679976905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189679976987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4231190 + ... + 4275783.

It is an arithmetic number, because the mean of its divisors is an integer number (25878214908).

Almost surely, 2^189679976981 is an apocalyptic number.

189679976981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

189679976981 is a deficient number, since it is larger than the sum of its proper divisors (17345742283).

189679976981 is a wasteful number, since it uses less digits than its factorization.

189679976981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8509011.

The product of its digits is 740710656, while the sum is 80.

The spelling of 189679976981 in words is "one hundred eighty-nine billion, six hundred seventy-nine million, nine hundred seventy-six thousand, nine hundred eighty-one".