231230145 has 32 divisors (see below), whose sum is σ = 378224640. Its totient is φ = 120593600.

The previous prime is 231230143. The next prime is 231230161. The reversal of 231230145 is 541032132.

It is not a de Polignac number, because 231230145 - 2¹ = 231230143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231230143) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200320 + ... + 201470.

It is an arithmetic number, because the mean of its divisors is an integer number (11819520).

Almost surely, 2^231230145 is an apocalyptic number.

It is an amenable number.

231230145 is a deficient number, since it is larger than the sum of its proper divisors (146994495).

231230145 is a wasteful number, since it uses less digits than its factorization.

231230145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1445.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 231230145 is about 15206.2534833535. The cubic root of 231230145 is about 613.7829457332.

Adding to 231230145 its reverse (541032132), we get a palindrome (772262277).

The spelling of 231230145 in words is "two hundred thirty-one million, two hundred thirty thousand, one hundred forty-five".