245105521 has 2 divisors, whose sum is σ = 245105522. Its totient is φ = 245105520.

The previous prime is 245105513. The next prime is 245105527. The reversal of 245105521 is 125501542.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163456225 + 81649296 = 12785^2 + 9036^2 .

It is a cyclic number.

It is not a de Polignac number, because 245105521 - 2³ = 245105513 is a prime.

It is not a weakly prime, because it can be changed into another prime (245105527) 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, 122552760 + 122552761.

It is an arithmetic number, because the mean of its divisors is an integer number (122552761).

Almost surely, 2^245105521 is an apocalyptic number.

It is an amenable number.

245105521 is a deficient number, since it is larger than the sum of its proper divisors (1).

245105521 is an equidigital number, since it uses as much as digits as its factorization.

245105521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 245105521 is about 15655.8462243342. The cubic root of 245105521 is about 625.8222955735.

The spelling of 245105521 in words is "two hundred forty-five million, one hundred five thousand, five hundred twenty-one".