231540047 has 4 divisors (see below), whose sum is σ = 231597480. Its totient is φ = 231482616.

The previous prime is 231540019. The next prime is 231540077. The reversal of 231540047 is 740045132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231540047 is a prime.

It is a super-2 number, since 2×231540047² = 107221586729524418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231539998 and 231540025.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231540077) 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, 22172 + ... + 30897.

It is an arithmetic number, because the mean of its divisors is an integer number (57899370).

Almost surely, 2^231540047 is an apocalyptic number.

231540047 is a deficient number, since it is larger than the sum of its proper divisors (57433).

231540047 is an equidigital number, since it uses as much as digits as its factorization.

231540047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57432.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 231540047 is about 15216.4400238689. The cubic root of 231540047 is about 614.0570271386.

Adding to 231540047 its reverse (740045132), we get a palindrome (971585179).

The spelling of 231540047 in words is "two hundred thirty-one million, five hundred forty thousand, forty-seven".