231604487 has 4 divisors (see below), whose sum is σ = 232395240. Its totient is φ = 230813736.

The previous prime is 231604403. The next prime is 231604489. The reversal of 231604487 is 784406132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231604487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231604489) 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, 394937 + ... + 395522.

It is an arithmetic number, because the mean of its divisors is an integer number (58098810).

Almost surely, 2^231604487 is an apocalyptic number.

231604487 is a deficient number, since it is larger than the sum of its proper divisors (790753).

231604487 is an equidigital number, since it uses as much as digits as its factorization.

231604487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790752.

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 231604487 is about 15218.5573232156. The cubic root of 231604487 is about 614.1139880042.

The spelling of 231604487 in words is "two hundred thirty-one million, six hundred four thousand, four hundred eighty-seven".