145531247 has 2 divisors, whose sum is σ = 145531248. Its totient is φ = 145531246.

The previous prime is 145531219. The next prime is 145531261. The reversal of 145531247 is 742135541.

145531247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145531247 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145531277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72765623 + 72765624.

It is an arithmetic number, because the mean of its divisors is an integer number (72765624).

Almost surely, 2^145531247 is an apocalyptic number.

145531247 is a deficient number, since it is larger than the sum of its proper divisors (1).

145531247 is an equidigital number, since it uses as much as digits as its factorization.

145531247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 32.

The square root of 145531247 is about 12063.6332421041. The cubic root of 145531247 is about 525.9996036275. Note that the first 3 decimals are identical.

Adding to 145531247 its reverse (742135541), we get a palindrome (887666788).

The spelling of 145531247 in words is "one hundred forty-five million, five hundred thirty-one thousand, two hundred forty-seven".