145305503 has 4 divisors (see below), whose sum is σ = 166063440. Its totient is φ = 124547568.

The previous prime is 145305497. The next prime is 145305539. The reversal of 145305503 is 305503541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 305503541 = 7 ⋅43643363.

It is a cyclic number.

It is not a de Polignac number, because 145305503 - 2¹⁰ = 145304479 is a prime.

It is a super-2 number, since 2×145305503² = 42227378404166018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145305403) 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, 10378958 + ... + 10378971.

It is an arithmetic number, because the mean of its divisors is an integer number (41515860).

Almost surely, 2^145305503 is an apocalyptic number.

145305503 is a deficient number, since it is larger than the sum of its proper divisors (20757937).

145305503 is an equidigital number, since it uses as much as digits as its factorization.

145305503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20757936.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 145305503 is about 12054.2732257071. The cubic root of 145305503 is about 525.7274909233.

The spelling of 145305503 in words is "one hundred forty-five million, three hundred five thousand, five hundred three".