1029491521 has 2 divisors, whose sum is σ = 1029491522. Its totient is φ = 1029491520.

The previous prime is 1029491501. The next prime is 1029491549. The reversal of 1029491521 is 1251949201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1026305296 + 3186225 = 32036^2 + 1785^2 .

It is an emirp because it is prime and its reverse (1251949201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1029491521 - 2⁹ = 1029491009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1029491501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 514745760 + 514745761.

It is an arithmetic number, because the mean of its divisors is an integer number (514745761).

Almost surely, 2^1029491521 is an apocalyptic number.

It is an amenable number.

1029491521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1029491521 is an equidigital number, since it uses as much as digits as its factorization.

1029491521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 1029491521 is about 32085.6902839880. The cubic root of 1029491521 is about 1009.7354210085.

The spelling of 1029491521 in words is "one billion, twenty-nine million, four hundred ninety-one thousand, five hundred twenty-one".