1531318404 has 108 divisors (see below), whose sum is σ = 4568856432. Its totient is φ = 397726560.

The previous prime is 1531318387. The next prime is 1531318427. The reversal of 1531318404 is 4048131351.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 60387 + ... + 81909.

Almost surely, 2^1531318404 is an apocalyptic number.

1531318404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1531318404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2284428216).

1531318404 is an abundant number, since it is smaller than the sum of its proper divisors (3037538028).

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

1531318404 is a wasteful number, since it uses less digits than its factorization.

1531318404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21566 (or 21546 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1531318404 is about 39132.0636307364. The cubic root of 1531318404 is about 1152.6262358766.

Adding to 1531318404 its reverse (4048131351), we get a palindrome (5579449755).

The spelling of 1531318404 in words is "one billion, five hundred thirty-one million, three hundred eighteen thousand, four hundred four".