231019989 has 8 divisors (see below), whose sum is σ = 309198912. Its totient is φ = 153427200.

The previous prime is 231019963. The next prime is 231019991. The reversal of 231019989 is 989910132.

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

It is not a de Polignac number, because 231019989 - 2¹² = 231015893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231019989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231019289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145612 + ... + 147189.

It is an arithmetic number, because the mean of its divisors is an integer number (38649864).

Almost surely, 2^231019989 is an apocalyptic number.

It is an amenable number.

231019989 is a deficient number, since it is larger than the sum of its proper divisors (78178923).

231019989 is a wasteful number, since it uses less digits than its factorization.

231019989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293067.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 231019989 is about 15199.3417291671. The cubic root of 231019989 is about 613.5969416311.

The spelling of 231019989 in words is "two hundred thirty-one million, nineteen thousand, nine hundred eighty-nine".