42144545 has 4 divisors (see below), whose sum is σ = 50573460. Its totient is φ = 33715632.

The previous prime is 42144539. The next prime is 42144551. The reversal of 42144545 is 54544124.

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

It is an interprime number because it is at equal distance from previous prime (42144539) and next prime (42144551).

It can be written as a sum of positive squares in 2 ways, for example, as 22819729 + 19324816 = 4777^2 + 4396^2 .

It is a cyclic number.

It is not a de Polignac number, because 42144545 - 2⁶ = 42144481 is a prime.

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, 4214450 + ... + 4214459.

It is an arithmetic number, because the mean of its divisors is an integer number (12643365).

Almost surely, 2^42144545 is an apocalyptic number.

It is an amenable number.

42144545 is a deficient number, since it is larger than the sum of its proper divisors (8428915).

42144545 is an equidigital number, since it uses as much as digits as its factorization.

42144545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8428914.

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

The square root of 42144545 is about 6491.8830088041. The cubic root of 42144545 is about 348.0009716140. Note that the first 3 decimals are identical.

Adding to 42144545 its reverse (54544124), we get a palindrome (96688669).

The spelling of 42144545 in words is "forty-two million, one hundred forty-four thousand, five hundred forty-five".