145403503 has 4 divisors (see below), whose sum is σ = 166175440. Its totient is φ = 124631568.

The previous prime is 145403501. The next prime is 145403543. The reversal of 145403503 is 305304541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305304541 = 479 ⋅637379.

It is a cyclic number.

It is not a de Polignac number, because 145403503 - 2¹ = 145403501 is a prime.

It is a super-3 number, since 3×145403503³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145403501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10385958 + ... + 10385971.

It is an arithmetic number, because the mean of its divisors is an integer number (41543860).

Almost surely, 2^145403503 is an apocalyptic number.

145403503 is a deficient number, since it is larger than the sum of its proper divisors (20771937).

145403503 is an equidigital number, since it uses as much as digits as its factorization.

145403503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20771936.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 145403503 is about 12058.3374890571. The cubic root of 145403503 is about 525.8456551008.

The spelling of 145403503 in words is "one hundred forty-five million, four hundred three thousand, five hundred three".