231532407 has 6 divisors (see below), whose sum is σ = 334435712. Its totient is φ = 154354932.

The previous prime is 231532403. The next prime is 231532447. The reversal of 231532407 is 704235132.

It is not a de Polignac number, because 231532407 - 2² = 231532403 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 (231532403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12862903 + ... + 12862920.

Almost surely, 2^231532407 is an apocalyptic number.

231532407 is a deficient number, since it is larger than the sum of its proper divisors (102903305).

231532407 is a wasteful number, since it uses less digits than its factorization.

231532407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25725829 (or 25725826 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 231532407 is about 15216.1889775331. The cubic root of 231532407 is about 614.0502731633.

Adding to 231532407 its reverse (704235132), we get a palindrome (935767539).

The spelling of 231532407 in words is "two hundred thirty-one million, five hundred thirty-two thousand, four hundred seven".