231420547 has 2 divisors, whose sum is σ = 231420548. Its totient is φ = 231420546.

The previous prime is 231420529. The next prime is 231420569. The reversal of 231420547 is 745024132.

231420547 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231420547 is a prime.

It is not a weakly prime, because it can be changed into another prime (231420577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115710273 + 115710274.

It is an arithmetic number, because the mean of its divisors is an integer number (115710274).

Almost surely, 2^231420547 is an apocalyptic number.

231420547 is a deficient number, since it is larger than the sum of its proper divisors (1).

231420547 is an equidigital number, since it uses as much as digits as its factorization.

231420547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 28.

The square root of 231420547 is about 15212.5128430513. The cubic root of 231420547 is about 613.9513687535.

Adding to 231420547 its reverse (745024132), we get a palindrome (976444679).

The spelling of 231420547 in words is "two hundred thirty-one million, four hundred twenty thousand, five hundred forty-seven".