231315143 has 4 divisors (see below), whose sum is σ = 231759648. Its totient is φ = 230870640.

The previous prime is 231315127. The next prime is 231315169. The reversal of 231315143 is 341513132.

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

It is a cyclic number.

It is not a de Polignac number, because 231315143 - 2⁴ = 231315127 is a prime.

It is a super-2 number, since 2×231315143² = 107013390762220898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231315193) 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, 221471 + ... + 222512.

It is an arithmetic number, because the mean of its divisors is an integer number (57939912).

Almost surely, 2^231315143 is an apocalyptic number.

231315143 is a deficient number, since it is larger than the sum of its proper divisors (444505).

231315143 is an equidigital number, since it uses as much as digits as its factorization.

231315143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444504.

The product of its digits is 1080, while the sum is 23.

The square root of 231315143 is about 15209.0480635706. The cubic root of 231315143 is about 613.8581434425.

Adding to 231315143 its reverse (341513132), we get a palindrome (572828275).

The spelling of 231315143 in words is "two hundred thirty-one million, three hundred fifteen thousand, one hundred forty-three".