1030530821 has 2 divisors, whose sum is σ = 1030530822. Its totient is φ = 1030530820.

The previous prime is 1030530817. The next prime is 1030530827. The reversal of 1030530821 is 1280350301.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 988410721 + 42120100 = 31439^2 + 6490^2 .

It is a cyclic number.

It is not a de Polignac number, because 1030530821 - 2² = 1030530817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1030530827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 515265410 + 515265411.

It is an arithmetic number, because the mean of its divisors is an integer number (515265411).

Almost surely, 2^1030530821 is an apocalyptic number.

It is an amenable number.

1030530821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1030530821 is an equidigital number, since it uses as much as digits as its factorization.

1030530821 is an evil number, because the sum of its binary digits is even.

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

The square root of 1030530821 is about 32101.8818918767. The cubic root of 1030530821 is about 1010.0750919563.

The spelling of 1030530821 in words is "one billion, thirty million, five hundred thirty thousand, eight hundred twenty-one".