145820503 has 4 divisors (see below), whose sum is σ = 145846120. Its totient is φ = 145794888.

The previous prime is 145820453. The next prime is 145820531. The reversal of 145820503 is 305028541.

145820503 is a nontrivial binomial coefficient, being equal to C(17078, 2).

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

It is a 3-Lehmer number, since φ(145820503) divides (145820503-1)³.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-145820503 is a prime.

It is a deceptive number, since it divides R_145820502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145820303) 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, 1 + ... + 17077.

It is an arithmetic number, because the mean of its divisors is an integer number (36461530).

Almost surely, 2^145820503 is an apocalyptic number.

145820503 is the 17077-th triangular number and also the 8539-th hexagonal number.

145820503 is the 5693-rd centered nonagonal number.

145820503 is a deficient number, since it is larger than the sum of its proper divisors (25617).

145820503 is an equidigital number, since it uses as much as digits as its factorization.

145820503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25616.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 145820503 is about 12075.6160505375. The cubic root of 145820503 is about 526.3478629712.

The spelling of 145820503 in words is "one hundred forty-five million, eight hundred twenty thousand, five hundred three".