1006533991 has 2 divisors, whose sum is σ = 1006533992. Its totient is φ = 1006533990.

The previous prime is 1006533929. The next prime is 1006534007. The reversal of 1006533991 is 1993356001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1006533991 - 2¹³ = 1006525799 is a prime.

It is a super-2 number, since 2×1006533991² = 2026221350076776162, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1006533991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1006533091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 503266995 + 503266996.

It is an arithmetic number, because the mean of its divisors is an integer number (503266996).

Almost surely, 2^1006533991 is an apocalyptic number.

1006533991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1006533991 is an equidigital number, since it uses as much as digits as its factorization.

1006533991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 1006533991 is about 31725.9198605809. The cubic root of 1006533991 is about 1002.1732704739.

Adding to 1006533991 its reverse (1993356001), we get a palindrome (2999889992).

The spelling of 1006533991 in words is "one billion, six million, five hundred thirty-three thousand, nine hundred ninety-one".