145242505 has 4 divisors (see below), whose sum is σ = 174291012. Its totient is φ = 116194000.

The previous prime is 145242497. The next prime is 145242511. The reversal of 145242505 is 505242541.

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

It can be written as a sum of positive squares in 2 ways, for example, as 36832761 + 108409744 = 6069^2 + 10412^2 .

It is not a de Polignac number, because 145242505 - 2³ = 145242497 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14524246 + ... + 14524255.

It is an arithmetic number, because the mean of its divisors is an integer number (43572753).

Almost surely, 2^145242505 is an apocalyptic number.

It is an amenable number.

145242505 is a deficient number, since it is larger than the sum of its proper divisors (29048507).

145242505 is an equidigital number, since it uses as much as digits as its factorization.

145242505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29048506.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 145242505 is about 12051.6598441874. The cubic root of 145242505 is about 525.6515025921.

The spelling of 145242505 in words is "one hundred forty-five million, two hundred forty-two thousand, five hundred five".