231000135 has 16 divisors (see below), whose sum is σ = 370445184. Its totient is φ = 122918432.

The previous prime is 231000113. The next prime is 231000151. The reversal of 231000135 is 531000132.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 231000135 - 2⁹ = 230999623 is a prime.

It is a super-2 number, since 2×231000135² = 106722124740036450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10737 + ... + 24026.

It is an arithmetic number, because the mean of its divisors is an integer number (23152824).

Almost surely, 2^231000135 is an apocalyptic number.

231000135 is a deficient number, since it is larger than the sum of its proper divisors (139445049).

231000135 is a wasteful number, since it uses less digits than its factorization.

231000135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35214.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 231000135 is about 15198.6885947440. The cubic root of 231000135 is about 613.5793634946.

Adding to 231000135 its reverse (531000132), we get a palindrome (762000267).

The spelling of 231000135 in words is "two hundred thirty-one million, one hundred thirty-five", and thus it is an aban number.