1531112540 has 48 divisors (see below), whose sum is σ = 3358303200. Its totient is φ = 585775872.

The previous prime is 1531112501. The next prime is 1531112551. The reversal of 1531112540 is 452111351.

It is a super-2 number, since 2×1531112540² = 4688611220290503200, which contains 22 as substring.

It is a congruent number.

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, 26126 + ... + 61194.

It is an arithmetic number, because the mean of its divisors is an integer number (69964650).

Almost surely, 2^1531112540 is an apocalyptic number.

1531112540 is a gapful number since it is divisible by the number (10) 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 1531112540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1679151600).

1531112540 is an abundant number, since it is smaller than the sum of its proper divisors (1827190660).

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

1531112540 is a wasteful number, since it uses less digits than its factorization.

1531112540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35174 (or 35172 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1531112540 is about 39129.4331673741. The cubic root of 1531112540 is about 1152.5745821554.

Adding to 1531112540 its reverse (452111351), we get a palindrome (1983223891).

The spelling of 1531112540 in words is "one billion, five hundred thirty-one million, one hundred twelve thousand, five hundred forty".