1245035521 has 2 divisors, whose sum is σ = 1245035522. Its totient is φ = 1245035520.

The previous prime is 1245035447. The next prime is 1245035531. The reversal of 1245035521 is 1255305421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1227521296 + 17514225 = 35036^2 + 4185^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245035521 - 2⁹ = 1245035009 is a prime.

It is a super-2 number, since 2×1245035521² = 3100226897103482882, 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 1245035521.

It is not a weakly prime, because it can be changed into another prime (1245035531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622517760 + 622517761.

It is an arithmetic number, because the mean of its divisors is an integer number (622517761).

Almost surely, 2^1245035521 is an apocalyptic number.

It is an amenable number.

1245035521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245035521 is an equidigital number, since it uses as much as digits as its factorization.

1245035521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 1245035521 is about 35285.0608756737. The cubic root of 1245035521 is about 1075.7893667960.

The spelling of 1245035521 in words is "one billion, two hundred forty-five million, thirty-five thousand, five hundred twenty-one".