320231987 has 4 divisors (see below), whose sum is σ = 320584416. Its totient is φ = 319879560.

The previous prime is 320231981. The next prime is 320231993. The reversal of 320231987 is 789132023.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (320231981) and next prime (320231993).

It is a cyclic number.

It is not a de Polignac number, because 320231987 - 2¹² = 320227891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320231981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 174848 + ... + 176669.

It is an arithmetic number, because the mean of its divisors is an integer number (80146104).

Almost surely, 2^320231987 is an apocalyptic number.

320231987 is a deficient number, since it is larger than the sum of its proper divisors (352429).

320231987 is an equidigital number, since it uses as much as digits as its factorization.

320231987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352428.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 320231987 is about 17895.0268789963. The cubic root of 320231987 is about 684.1556271568.

The spelling of 320231987 in words is "three hundred twenty million, two hundred thirty-one thousand, nine hundred eighty-seven".