931009989 has 32 divisors (see below), whose sum is σ = 1532575744. Its totient is φ = 489551040.

The previous prime is 931009987. The next prime is 931009993. The reversal of 931009989 is 989900139.

It is not a de Polignac number, because 931009989 - 2¹ = 931009987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (931009987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85212 + ... + 95514.

It is an arithmetic number, because the mean of its divisors is an integer number (47892992).

Almost surely, 2^931009989 is an apocalyptic number.

It is an amenable number.

931009989 is a deficient number, since it is larger than the sum of its proper divisors (601565755).

931009989 is a wasteful number, since it uses less digits than its factorization.

931009989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10657.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 931009989 is about 30512.4562924718. The cubic root of 931009989 is about 976.4532311828.

The spelling of 931009989 in words is "nine hundred thirty-one million, nine thousand, nine hundred eighty-nine".