231122513 has 4 divisors (see below), whose sum is σ = 231365988. Its totient is φ = 230879040.

The previous prime is 231122509. The next prime is 231122519. The reversal of 231122513 is 315221132.

231122513 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 117657409 + 113465104 = 10847^2 + 10652^2 .

It is a cyclic number.

It is not a de Polignac number, because 231122513 - 2² = 231122509 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231122519) 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, 120308 + ... + 122213.

It is an arithmetic number, because the mean of its divisors is an integer number (57841497).

Almost surely, 2^231122513 is an apocalyptic number.

It is an amenable number.

231122513 is a deficient number, since it is larger than the sum of its proper divisors (243475).

231122513 is an equidigital number, since it uses as much as digits as its factorization.

231122513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243474.

The product of its digits is 360, while the sum is 20.

The square root of 231122513 is about 15202.7140011249. The cubic root of 231122513 is about 613.6876972830.

Adding to 231122513 its reverse (315221132), we get a palindrome (546343645).

The spelling of 231122513 in words is "two hundred thirty-one million, one hundred twenty-two thousand, five hundred thirteen".