231306478 has 8 divisors (see below), whose sum is σ = 373648968. Its totient is φ = 106756824.

The previous prime is 231306473. The next prime is 231306479. The reversal of 231306478 is 874603132.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231306473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4448176 + ... + 4448227.

It is an arithmetic number, because the mean of its divisors is an integer number (46706121).

Almost surely, 2^231306478 is an apocalyptic number.

231306478 is a deficient number, since it is larger than the sum of its proper divisors (142342490).

231306478 is a wasteful number, since it uses less digits than its factorization.

231306478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8896418.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 231306478 is about 15208.7631975779. The cubic root of 231306478 is about 613.8504783625.

The spelling of 231306478 in words is "two hundred thirty-one million, three hundred six thousand, four hundred seventy-eight".