231601655 has 16 divisors (see below), whose sum is σ = 284934144. Its totient is φ = 180623520.

The previous prime is 231601613. The next prime is 231601663. The reversal of 231601655 is 556106132.

It is not a de Polignac number, because 231601655 - 2²⁰ = 230553079 is a prime.

It is a Duffinian number.

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, 212522 + ... + 213608.

It is an arithmetic number, because the mean of its divisors is an integer number (17808384).

Almost surely, 2^231601655 is an apocalyptic number.

231601655 is a deficient number, since it is larger than the sum of its proper divisors (53332489).

231601655 is a wasteful number, since it uses less digits than its factorization.

231601655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 231601655 is about 15218.4642786321. The cubic root of 231601655 is about 614.1114849181. Note that the first 3 decimals are identical.

Adding to 231601655 its reverse (556106132), we get a palindrome (787707787).

The spelling of 231601655 in words is "two hundred thirty-one million, six hundred one thousand, six hundred fifty-five".