231005605 has 8 divisors (see below), whose sum is σ = 293513112. Its totient is φ = 173933568.

The previous prime is 231005539. The next prime is 231005609. The reversal of 231005605 is 506500132.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 100520676 + 130484929 = 10026^2 + 11423^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 231005605 - 2¹¹ = 231003557 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 (231005609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1358772 + ... + 1358941.

It is an arithmetic number, because the mean of its divisors is an integer number (36689139).

Almost surely, 2^231005605 is an apocalyptic number.

It is an amenable number.

231005605 is a deficient number, since it is larger than the sum of its proper divisors (62507507).

231005605 is a wasteful number, since it uses less digits than its factorization.

231005605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717735.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 231005605 is about 15198.8685434147. The cubic root of 231005605 is about 613.5842065691.

Adding to 231005605 its reverse (506500132), we get a palindrome (737505737).

The spelling of 231005605 in words is "two hundred thirty-one million, five thousand, six hundred five".