145454242 has 4 divisors (see below), whose sum is σ = 218181366. Its totient is φ = 72727120.

The previous prime is 145454209. The next prime is 145454269. The reversal of 145454242 is 242454541.

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

It can be written as a sum of positive squares in only one way, i.e., 112975641 + 32478601 = 10629^2 + 5699^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36363559 + ... + 36363562.

Almost surely, 2^145454242 is an apocalyptic number.

145454242 is a deficient number, since it is larger than the sum of its proper divisors (72727124).

145454242 is an equidigital number, since it uses as much as digits as its factorization.

145454242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72727123.

The product of its digits is 25600, while the sum is 31.

The square root of 145454242 is about 12060.4412025431. The cubic root of 145454242 is about 525.9068131410.

It can be divided in two parts, 1454 and 54242, that added together give a square (55696 = 236²).

The spelling of 145454242 in words is "one hundred forty-five million, four hundred fifty-four thousand, two hundred forty-two".