231513605 has 16 divisors (see below), whose sum is σ = 286374528. Its totient is φ = 179592000.

The previous prime is 231513577. The next prime is 231513629. The reversal of 231513605 is 506315132.

231513605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 231513605 - 2¹⁴ = 231497221 is a prime.

It is a Duffinian number.

It is a Curzon 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, 16310 + ... + 27000.

It is an arithmetic number, because the mean of its divisors is an integer number (17898408).

Almost surely, 2^231513605 is an apocalyptic number.

It is an amenable number.

231513605 is a deficient number, since it is larger than the sum of its proper divisors (54860923).

231513605 is a wasteful number, since it uses less digits than its factorization.

231513605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10828.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 231513605 is about 15215.5711361749. The cubic root of 231513605 is about 614.0336510326.

Adding to 231513605 its reverse (506315132), we get a palindrome (737828737).

The spelling of 231513605 in words is "two hundred thirty-one million, five hundred thirteen thousand, six hundred five".