145620247 has 2 divisors, whose sum is σ = 145620248. Its totient is φ = 145620246.

The previous prime is 145620239. The next prime is 145620269. The reversal of 145620247 is 742026541.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 145620247 - 2³ = 145620239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145620227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72810123 + 72810124.

It is an arithmetic number, because the mean of its divisors is an integer number (72810124).

Almost surely, 2^145620247 is an apocalyptic number.

145620247 is a deficient number, since it is larger than the sum of its proper divisors (1).

145620247 is an equidigital number, since it uses as much as digits as its factorization.

145620247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 145620247 is about 12067.3214509269. The cubic root of 145620247 is about 526.1068072370.

Adding to 145620247 its reverse (742026541), we get a palindrome (887646788).

The spelling of 145620247 in words is "one hundred forty-five million, six hundred twenty thousand, two hundred forty-seven".