1328531 has 2 divisors, whose sum is σ = 1328532. Its totient is φ = 1328530.

The previous prime is 1328521. The next prime is 1328539. The reversal of 1328531 is 1358231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1328531 is a prime.

It is a super-2 number, since 2×1328531² = 3529989235922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1328497 and 1328506.

It is not a weakly prime, because it can be changed into another prime (1328539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 664265 + 664266.

It is an arithmetic number, because the mean of its divisors is an integer number (664266).

2^1328531 is an apocalyptic number.

1328531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1328531 is an equidigital number, since it uses as much as digits as its factorization.

1328531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 23.

The square root of 1328531 is about 1152.6191912336. The cubic root of 1328531 is about 109.9319413709.

The spelling of 1328531 in words is "one million, three hundred twenty-eight thousand, five hundred thirty-one".