3145205521 has 2 divisors, whose sum is σ = 3145205522. Its totient is φ = 3145205520.

The previous prime is 3145205519. The next prime is 3145205551. The reversal of 3145205521 is 1255025413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3144966400 + 239121 = 56080^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 3145205521 - 2¹ = 3145205519 is a prime.

Together with 3145205519, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 3145205521.

It is not a weakly prime, because it can be changed into another prime (3145205551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1572602760 + 1572602761.

It is an arithmetic number, because the mean of its divisors is an integer number (1572602761).

Almost surely, 2^3145205521 is an apocalyptic number.

It is an amenable number.

3145205521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3145205521 is an equidigital number, since it uses as much as digits as its factorization.

3145205521 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 3145205521 is about 56082.1319227435. The cubic root of 3145205521 is about 1465.1531049436.

The spelling of 3145205521 in words is "three billion, one hundred forty-five million, two hundred five thousand, five hundred twenty-one".