1531140321 has 16 divisors (see below), whose sum is σ = 2091358208. Its totient is φ = 996105600.

The previous prime is 1531140319. The next prime is 1531140349. The reversal of 1531140321 is 1230411351.

It is not a de Polignac number, because 1531140321 - 2¹ = 1531140319 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1531140301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9700 + ... + 56181.

It is an arithmetic number, because the mean of its divisors is an integer number (130709888).

Almost surely, 2^1531140321 is an apocalyptic number.

It is an amenable number.

1531140321 is a deficient number, since it is larger than the sum of its proper divisors (560217887).

1531140321 is a wasteful number, since it uses less digits than its factorization.

1531140321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66072.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1531140321 is about 39129.7881542949. The cubic root of 1531140321 is about 1152.5815530083.

Adding to 1531140321 its reverse (1230411351), we get a palindrome (2761551672).

The spelling of 1531140321 in words is "one billion, five hundred thirty-one million, one hundred forty thousand, three hundred twenty-one".