1245620513 has 2 divisors, whose sum is σ = 1245620514. Its totient is φ = 1245620512.

The previous prime is 1245620507. The next prime is 1245620527. The reversal of 1245620513 is 3150265421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1219895329 + 25725184 = 34927^2 + 5072^2 .

It is an emirp because it is prime and its reverse (3150265421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1245620513 - 2¹⁰ = 1245619489 is a prime.

It is a super-3 number, since 3×1245620513³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1245628513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622810256 + 622810257.

It is an arithmetic number, because the mean of its divisors is an integer number (622810257).

Almost surely, 2^1245620513 is an apocalyptic number.

It is an amenable number.

1245620513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245620513 is an equidigital number, since it uses as much as digits as its factorization.

1245620513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1245620513 is about 35293.3494160019. The cubic root of 1245620513 is about 1075.9578304323.

Adding to 1245620513 its reverse (3150265421), we get a palindrome (4395885934).

The spelling of 1245620513 in words is "one billion, two hundred forty-five million, six hundred twenty thousand, five hundred thirteen".