1305123303 has 24 divisors (see below), whose sum is σ = 2025266544. Its totient is φ = 744451840.

The previous prime is 1305123283. The next prime is 1305123317. The reversal of 1305123303 is 3033215031.

It is not a de Polignac number, because 1305123303 - 2⁵ = 1305123271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1305123303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1305123103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 99576 + ... + 111917.

It is an arithmetic number, because the mean of its divisors is an integer number (84386106).

Almost surely, 2^1305123303 is an apocalyptic number.

1305123303 is a deficient number, since it is larger than the sum of its proper divisors (720143241).

1305123303 is a wasteful number, since it uses less digits than its factorization.

1305123303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211535 (or 211524 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 21.

The square root of 1305123303 is about 36126.4903221999. The cubic root of 1305123303 is about 1092.8247310234.

Adding to 1305123303 its reverse (3033215031), we get a palindrome (4338338334).

The spelling of 1305123303 in words is "one billion, three hundred five million, one hundred twenty-three thousand, three hundred three".