145504013 has 4 divisors (see below), whose sum is σ = 146480700. Its totient is φ = 144527328.

The previous prime is 145503973. The next prime is 145504019. The reversal of 145504013 is 310405541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 310405541 = 5869 ⋅52889.

It can be written as a sum of positive squares in 2 ways, for example, as 84695209 + 60808804 = 9203^2 + 7798^2 .

It is a cyclic number.

It is not a de Polignac number, because 145504013 - 2¹⁶ = 145438477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 145504013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145504019) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 488120 + ... + 488417.

It is an arithmetic number, because the mean of its divisors is an integer number (36620175).

Almost surely, 2^145504013 is an apocalyptic number.

It is an amenable number.

145504013 is a deficient number, since it is larger than the sum of its proper divisors (976687).

145504013 is an equidigital number, since it uses as much as digits as its factorization.

145504013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976686.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 145504013 is about 12062.5044248697. The cubic root of 145504013 is about 525.9667905899.

Adding to 145504013 its reverse (310405541), we get a palindrome (455909554).

The spelling of 145504013 in words is "one hundred forty-five million, five hundred four thousand, thirteen".