1241021569 has 2 divisors, whose sum is σ = 1241021570. Its totient is φ = 1241021568.

The previous prime is 1241021491. The next prime is 1241021591. The reversal of 1241021569 is 9651201421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 851472400 + 389549169 = 29180^2 + 19737^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1241021569 is a prime.

It is a super-2 number, since 2×1241021569² = 3080269069446443522, 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 1241021569.

It is not a weakly prime, because it can be changed into another prime (1241021269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620510784 + 620510785.

It is an arithmetic number, because the mean of its divisors is an integer number (620510785).

Almost surely, 2^1241021569 is an apocalyptic number.

It is an amenable number.

1241021569 is a deficient number, since it is larger than the sum of its proper divisors (1).

1241021569 is an equidigital number, since it uses as much as digits as its factorization.

1241021569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 1241021569 is about 35228.1360420900. The cubic root of 1241021569 is about 1074.6320194277.

The spelling of 1241021569 in words is "one billion, two hundred forty-one million, twenty-one thousand, five hundred sixty-nine".