1311884644 has 18 divisors (see below), whose sum is σ = 2670622710. Its totient is φ = 562236192.

The previous prime is 1311884599. The next prime is 1311884663. The reversal of 1311884644 is 4464881131.

It can be written as a sum of positive squares in only one way, i.e., 1232852544 + 79032100 = 35112^2 + 8890^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1311884597 and 1311884606.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3346449 + ... + 3346840.

Almost surely, 2^1311884644 is an apocalyptic number.

1311884644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1311884644 is an abundant number, since it is smaller than the sum of its proper divisors (1358738066).

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

1311884644 is a wasteful number, since it uses less digits than its factorization.

1311884644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6693307 (or 6693298 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 1311884644 is about 36219.9481501562. The cubic root of 1311884644 is about 1094.7086494379.

The spelling of 1311884644 in words is "one billion, three hundred eleven million, eight hundred eighty-four thousand, six hundred forty-four".