145242245 has 4 divisors (see below), whose sum is σ = 174290700. Its totient is φ = 116193792.

The previous prime is 145242157. The next prime is 145242269. The reversal of 145242245 is 542242541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 542242541 = 1439 ⋅376819.

It can be written as a sum of positive squares in 2 ways, for example, as 19061956 + 126180289 = 4366^2 + 11233^2 .

It is a cyclic number.

It is not a de Polignac number, because 145242245 - 2²⁰ = 144193669 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14524220 + ... + 14524229.

It is an arithmetic number, because the mean of its divisors is an integer number (43572675).

Almost surely, 2^145242245 is an apocalyptic number.

It is an amenable number.

145242245 is a deficient number, since it is larger than the sum of its proper divisors (29048455).

145242245 is an equidigital number, since it uses as much as digits as its factorization.

145242245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29048454.

The product of its digits is 12800, while the sum is 29.

The square root of 145242245 is about 12051.6490572867. The cubic root of 145242245 is about 525.6511889340.

Adding to 145242245 its reverse (542242541), we get a palindrome (687484786).

The spelling of 145242245 in words is "one hundred forty-five million, two hundred forty-two thousand, two hundred forty-five".