1530981 has 20 divisors (see below), whose sum is σ = 2347884. Its totient is φ = 993600.

The previous prime is 1530967. The next prime is 1531021. The reversal of 1530981 is 1890351.

It can be written as a sum of positive squares in 2 ways, for example, as 245025 + 1285956 = 495^2 + 1134^2 .

It is not a de Polignac number, because 1530981 - 2⁷ = 1530853 is a prime.

It is a super-2 number, since 2×1530981² = 4687805644722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1530911) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3091 + ... + 3551.

2^1530981 is an apocalyptic number.

It is an amenable number.

1530981 is a deficient number, since it is larger than the sum of its proper divisors (816903).

1530981 is an equidigital number, since it uses as much as digits as its factorization.

1530981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514 (or 505 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1530981 is about 1237.3281698887. The cubic root of 1530981 is about 115.2541574784.

The spelling of 1530981 in words is "one million, five hundred thirty thousand, nine hundred eighty-one".