1305055503 has 16 divisors (see below), whose sum is σ = 1937628000. Its totient is φ = 868141440.

The previous prime is 1305055487. The next prime is 1305055519. The reversal of 1305055503 is 3055505031.

It is an interprime number because it is at equal distance from previous prime (1305055487) and next prime (1305055519).

It is not a de Polignac number, because 1305055503 - 2⁴ = 1305055487 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305055553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39978 + ... + 64871.

It is an arithmetic number, because the mean of its divisors is an integer number (121101750).

Almost surely, 2^1305055503 is an apocalyptic number.

1305055503 is a deficient number, since it is larger than the sum of its proper divisors (632572497).

1305055503 is a wasteful number, since it uses less digits than its factorization.

1305055503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105319 (or 105313 counting only the distinct ones).

The product of its (nonzero) digits is 5625, while the sum is 27.

The square root of 1305055503 is about 36125.5519404202. The cubic root of 1305055503 is about 1092.8058069366.

The spelling of 1305055503 in words is "one billion, three hundred five million, fifty-five thousand, five hundred three".