231306655 has 16 divisors (see below), whose sum is σ = 288000000. Its totient is φ = 178152480.

The previous prime is 231306643. The next prime is 231306661. The reversal of 231306655 is 556603132.

It is not a de Polignac number, because 231306655 - 2⁵ = 231306623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27096 + ... + 34594.

It is an arithmetic number, because the mean of its divisors is an integer number (18000000).

Almost surely, 2^231306655 is an apocalyptic number.

231306655 is a deficient number, since it is larger than the sum of its proper divisors (56693345).

231306655 is a wasteful number, since it uses less digits than its factorization.

231306655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7734.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 231306655 is about 15208.7690165904. The cubic root of 231306655 is about 613.8506349391.

Adding to 231306655 its reverse (556603132), we get a palindrome (787909787).

The spelling of 231306655 in words is "two hundred thirty-one million, three hundred six thousand, six hundred fifty-five".