1315321644 has 48 divisors (see below), whose sum is σ = 3777337088. Its totient is φ = 346897728.

The previous prime is 1315321627. The next prime is 1315321673. The reversal of 1315321644 is 4461235131.

1315321644 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 601162 + ... + 603345.

Almost surely, 2^1315321644 is an apocalyptic number.

1315321644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1315321644 is an abundant number, since it is smaller than the sum of its proper divisors (2462015444).

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

1315321644 is a wasteful number, since it uses less digits than its factorization.

1315321644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1204534 (or 1204532 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 1315321644 is about 36267.3633450241. The cubic root of 1315321644 is about 1095.6638230051.

Adding to 1315321644 its reverse (4461235131), we get a palindrome (5776556775).

The spelling of 1315321644 in words is "one billion, three hundred fifteen million, three hundred twenty-one thousand, six hundred forty-four".