1528981 has 4 divisors (see below), whose sum is σ = 1533600. Its totient is φ = 1524364.

The previous prime is 1528979. The next prime is 1528993. The reversal of 1528981 is 1898251.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1898251 = 233 ⋅8147.

It is a cyclic number.

It is not a de Polignac number, because 1528981 - 2¹ = 1528979 is a prime.

It is a super-2 number, since 2×1528981² = 4675565796722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1528781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1771 + ... + 2488.

It is an arithmetic number, because the mean of its divisors is an integer number (383400).

2^1528981 is an apocalyptic number.

It is an amenable number.

1528981 is a deficient number, since it is larger than the sum of its proper divisors (4619).

1528981 is an equidigital number, since it uses as much as digits as its factorization.

1528981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4618.

The product of its digits is 5760, while the sum is 34.

The square root of 1528981 is about 1236.5197127422. The cubic root of 1528981 is about 115.2039481109.

The spelling of 1528981 in words is "one million, five hundred twenty-eight thousand, nine hundred eighty-one".