231217545 has 32 divisors (see below), whose sum is σ = 400667904. Its totient is φ = 113184000.

The previous prime is 231217543. The next prime is 231217559. The reversal of 231217545 is 545712132.

It is not a de Polignac number, because 231217545 - 2¹ = 231217543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231217541) 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, 32020 + ... + 38570.

It is an arithmetic number, because the mean of its divisors is an integer number (12520872).

Almost surely, 2^231217545 is an apocalyptic number.

It is an amenable number.

231217545 is a deficient number, since it is larger than the sum of its proper divisors (169450359).

231217545 is a wasteful number, since it uses less digits than its factorization.

231217545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6753.

The product of its digits is 8400, while the sum is 30.

The square root of 231217545 is about 15205.8391744750. The cubic root of 231217545 is about 613.7717969481.

Adding to 231217545 its reverse (545712132), we get a palindrome (776929677).

The spelling of 231217545 in words is "two hundred thirty-one million, two hundred seventeen thousand, five hundred forty-five".