1029797621 has 2 divisors, whose sum is σ = 1029797622. Its totient is φ = 1029797620.

The previous prime is 1029797617. The next prime is 1029797633. The reversal of 1029797621 is 1267979201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1029511396 + 286225 = 32086^2 + 535^2 .

It is an emirp because it is prime and its reverse (1267979201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1029797621 - 2² = 1029797617 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1029797611) 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 as a sum of consecutive naturals, namely, 514898810 + 514898811.

It is an arithmetic number, because the mean of its divisors is an integer number (514898811).

Almost surely, 2^1029797621 is an apocalyptic number.

It is an amenable number.

1029797621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1029797621 is an equidigital number, since it uses as much as digits as its factorization.

1029797621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 1029797621 is about 32090.4599686574. The cubic root of 1029797621 is about 1009.8354863897.

The spelling of 1029797621 in words is "one billion, twenty-nine million, seven hundred ninety-seven thousand, six hundred twenty-one".