1531312340 has 24 divisors (see below), whose sum is σ = 3302669832. Its totient is φ = 595969920.

The previous prime is 1531312327. The next prime is 1531312361. The reversal of 1531312340 is 432131351.

It can be written as a sum of positive squares in 4 ways, for example, as 518290756 + 1013021584 = 22766^2 + 31828^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1033931 + ... + 1035410.

It is an arithmetic number, because the mean of its divisors is an integer number (137611243).

Almost surely, 2^1531312340 is an apocalyptic number.

1531312340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1531312340 is an abundant number, since it is smaller than the sum of its proper divisors (1771357492).

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

1531312340 is a wasteful number, since it uses less digits than its factorization.

1531312340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2069387 (or 2069385 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 1531312340 is about 39131.9861494405. The cubic root of 1531312340 is about 1152.6247144132.

Adding to 1531312340 its reverse (432131351), we get a palindrome (1963443691).

The spelling of 1531312340 in words is "one billion, five hundred thirty-one million, three hundred twelve thousand, three hundred forty".