231745539 has 16 divisors (see below), whose sum is σ = 323737344. Its totient is φ = 147180000.

The previous prime is 231745537. The next prime is 231745543. The reversal of 231745539 is 935547132.

It is a happy number.

It is not a de Polignac number, because 231745539 - 2¹ = 231745537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231745497 and 231745506.

It is not an unprimeable number, because it can be changed into a prime (231745537) 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, 10629 + ... + 24009.

It is an arithmetic number, because the mean of its divisors is an integer number (20233584).

Almost surely, 2^231745539 is an apocalyptic number.

231745539 is a deficient number, since it is larger than the sum of its proper divisors (91991805).

231745539 is a wasteful number, since it uses less digits than its factorization.

231745539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13658.

The product of its digits is 113400, while the sum is 39.

The square root of 231745539 is about 15223.1908284696. The cubic root of 231745539 is about 614.2386321457.

The spelling of 231745539 in words is "two hundred thirty-one million, seven hundred forty-five thousand, five hundred thirty-nine".