189006981 has 16 divisors (see below), whose sum is σ = 256238400. Its totient is φ = 123907968.

The previous prime is 189006971. The next prime is 189006991. The reversal of 189006981 is 189600981.

It is an interprime number because it is at equal distance from previous prime (189006971) and next prime (189006991).

It is not a de Polignac number, because 189006981 - 2⁹ = 189006469 is a prime.

It is a super-2 number, since 2×189006981² = 71447277733468722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189006971) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42690 + ... + 46908.

It is an arithmetic number, because the mean of its divisors is an integer number (16014900).

Almost surely, 2^189006981 is an apocalyptic number.

It is an amenable number.

189006981 is a deficient number, since it is larger than the sum of its proper divisors (67231419).

189006981 is a wasteful number, since it uses less digits than its factorization.

189006981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4468.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 189006981 is about 13747.9809790383. The cubic root of 189006981 is about 573.8864204445.

The spelling of 189006981 in words is "one hundred eighty-nine million, six thousand, nine hundred eighty-one".