1303312520 has 16 divisors (see below), whose sum is σ = 2932453260. Its totient is φ = 521324992.

The previous prime is 1303312501. The next prime is 1303312541. The reversal of 1303312520 is 252133031.

It can be written as a sum of positive squares in 2 ways, for example, as 1183497604 + 119814916 = 34402^2 + 10946^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1303312492 and 1303312501.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16291367 + ... + 16291446.

Almost surely, 2^1303312520 is an apocalyptic number.

1303312520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1303312520 is an abundant number, since it is smaller than the sum of its proper divisors (1629140740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1303312520 is a wasteful number, since it uses less digits than its factorization.

1303312520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32582824 (or 32582820 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 1303312520 is about 36101.4199166736. The cubic root of 1303312520 is about 1092.3190867585.

Adding to 1303312520 its reverse (252133031), we get a palindrome (1555445551).

The spelling of 1303312520 in words is "one billion, three hundred three million, three hundred twelve thousand, five hundred twenty".