231043513 has 4 divisors (see below), whose sum is σ = 232730100. Its totient is φ = 229356928.

The previous prime is 231043511. The next prime is 231043517. The reversal of 231043513 is 315340132.

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 60793209 + 170250304 = 7797^2 + 13048^2 .

It is a cyclic number.

It is not a de Polignac number, because 231043513 - 2¹ = 231043511 is a prime.

It is a super-2 number, since 2×231043513² = 106762209798762338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231043511) 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, 843088 + ... + 843361.

It is an arithmetic number, because the mean of its divisors is an integer number (58182525).

Almost surely, 2^231043513 is an apocalyptic number.

It is an amenable number.

231043513 is a deficient number, since it is larger than the sum of its proper divisors (1686587).

231043513 is a wasteful number, since it uses less digits than its factorization.

231043513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686586.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 231043513 is about 15200.1155587713. The cubic root of 231043513 is about 613.6177677720.

Adding to 231043513 its reverse (315340132), we get a palindrome (546383645).

The spelling of 231043513 in words is "two hundred thirty-one million, forty-three thousand, five hundred thirteen".