1531250 has 42 divisors (see below), whose sum is σ = 3339801. Its totient is φ = 525000.

The previous prime is 1531217. The next prime is 1531253. The reversal of 1531250 is 521351.

It can be written as a sum of positive squares in 4 ways, for example, as 261121 + 1270129 = 511^2 + 1127^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=875.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1531253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 218747 + ... + 218753.

2^1531250 is an apocalyptic number.

1531250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1531250 is an abundant number, since it is smaller than the sum of its proper divisors (1808551).

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

1531250 is an frugal number, since it uses more digits than its factorization.

1531250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46 (or 14 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1531250 is about 1237.4368670765. The cubic root of 1531250 is about 115.2609073015.

The spelling of 1531250 in words is "one million, five hundred thirty-one thousand, two hundred fifty".