231261605 has 16 divisors (see below), whose sum is σ = 281458800. Its totient is φ = 182392320.

The previous prime is 231261601. The next prime is 231261623. The reversal of 231261605 is 506162132.

231261605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 160801 + 231100804 = 401^2 + 15202^2 .

It is not a de Polignac number, because 231261605 - 2² = 231261601 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231261601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225995 + ... + 227015.

It is an arithmetic number, because the mean of its divisors is an integer number (17591175).

Almost surely, 2^231261605 is an apocalyptic number.

It is an amenable number.

231261605 is a deficient number, since it is larger than the sum of its proper divisors (50197195).

231261605 is a wasteful number, since it uses less digits than its factorization.

231261605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 231261605 is about 15207.2878910080. The cubic root of 231261605 is about 613.8107805351.

The spelling of 231261605 in words is "two hundred thirty-one million, two hundred sixty-one thousand, six hundred five".