231509361 has 4 divisors (see below), whose sum is σ = 308679152. Its totient is φ = 154339572.

The previous prime is 231509323. The next prime is 231509363. The reversal of 231509361 is 163905132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231509361 - 2⁶ = 231509297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231509363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38584891 + ... + 38584896.

It is an arithmetic number, because the mean of its divisors is an integer number (77169788).

Almost surely, 2^231509361 is an apocalyptic number.

It is an amenable number.

231509361 is a deficient number, since it is larger than the sum of its proper divisors (77169791).

231509361 is an equidigital number, since it uses as much as digits as its factorization.

231509361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77169790.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 231509361 is about 15215.4316731403. The cubic root of 231509361 is about 614.0298989497.

The spelling of 231509361 in words is "two hundred thirty-one million, five hundred nine thousand, three hundred sixty-one".