1311643528 has 16 divisors (see below), whose sum is σ = 2648511180. Its totient is φ = 605373888.

The previous prime is 1311643519. The next prime is 1311643537. The reversal of 1311643528 is 8253461131.

It is an interprime number because it is at equal distance from previous prime (1311643519) and next prime (1311643537).

It can be written as a sum of positive squares in 2 ways, for example, as 1004763204 + 306880324 = 31698^2 + 17518^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1311643493 and 1311643502.

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, 6305875 + ... + 6306082.

Almost surely, 2^1311643528 is an apocalyptic number.

It is an amenable number.

1311643528 is an abundant number, since it is smaller than the sum of its proper divisors (1336867652).

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

1311643528 is a wasteful number, since it uses less digits than its factorization.

1311643528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12611976 (or 12611972 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 1311643528 is about 36216.6194998926. The cubic root of 1311643528 is about 1094.6415785146.

It can be divided in two parts, 13116 and 43528, that added together give a square (56644 = 238²).

The spelling of 1311643528 in words is "one billion, three hundred eleven million, six hundred forty-three thousand, five hundred twenty-eight".