1531500000 has 168 divisors, whose sum is σ = 5030091864. Its totient is φ = 408000000.

The previous prime is 1531499987. The next prime is 1531500001. The reversal of 1531500000 is 51351.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1531500001) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 1499490 + ... + 1500510.

It is an arithmetic number, because the mean of its divisors is an integer number (29941023).

Almost surely, 2^1531500000 is an apocalyptic number.

1531500000 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 1531500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2515045932).

1531500000 is an abundant number, since it is smaller than the sum of its proper divisors (3498591864).

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

1531500000 is an frugal number, since it uses more digits than its factorization.

1531500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064 (or 1031 counting only the distinct ones).

The product of its (nonzero) digits is 75, while the sum is 15.

The square root of 1531500000 is about 39134.3838586990. The cubic root of 1531500000 is about 1152.6717966256.

Adding to 1531500000 its reverse (51351), we get a palindrome (1531551351).

The spelling of 1531500000 in words is "one billion, five hundred thirty-one million, five hundred thousand".