1530531725 has 18 divisors (see below), whose sum is σ = 1913581950. Its totient is φ = 1214310400.

The previous prime is 1530531707. The next prime is 1530531727. The reversal of 1530531725 is 5271350351.

It can be written as a sum of positive squares in 9 ways, for example, as 120604324 + 1409927401 = 10982^2 + 37549^2 .

It is not a de Polignac number, because 1530531725 - 2⁶ = 1530531661 is a prime.

It is a super-2 number, since 2×1530531725² = 4685054722462951250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1530531691 and 1530531700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1530531727) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 2387405 + ... + 2388045.

Almost surely, 2^1530531725 is an apocalyptic number.

It is an amenable number.

1530531725 is a deficient number, since it is larger than the sum of its proper divisors (383050225).

1530531725 is an frugal number, since it uses more digits than its factorization.

1530531725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441 (or 795 counting only the distinct ones).

The product of its (nonzero) digits is 15750, while the sum is 32.

The square root of 1530531725 is about 39122.0107484265. The cubic root of 1530531725 is about 1152.4288238143.

The spelling of 1530531725 in words is "one billion, five hundred thirty million, five hundred thirty-one thousand, seven hundred twenty-five".