1029220991 has 8 divisors (see below), whose sum is σ = 1090681200. Its totient is φ = 969492160.

The previous prime is 1029220979. The next prime is 1029221023. The reversal of 1029220991 is 1990229201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1029220991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1029220921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 431621 + ... + 433998.

It is an arithmetic number, because the mean of its divisors is an integer number (136335150).

Almost surely, 2^1029220991 is an apocalyptic number.

1029220991 is a deficient number, since it is larger than the sum of its proper divisors (61460209).

1029220991 is an equidigital number, since it uses as much as digits as its factorization.

1029220991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865689.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 1029220991 is about 32081.4742647529. The cubic root of 1029220991 is about 1009.6469670975.

The spelling of 1029220991 in words is "one billion, twenty-nine million, two hundred twenty thousand, nine hundred ninety-one".