61228907513 has 2 divisors, whose sum is σ = 61228907514. Its totient is φ = 61228907512.

The previous prime is 61228907503. The next prime is 61228907521. The reversal of 61228907513 is 31570982216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50385434089 + 10843473424 = 224467^2 + 104132^2 .

It is a cyclic number.

It is not a de Polignac number, because 61228907513 - 2¹⁰ = 61228906489 is a prime.

It is not a weakly prime, because it can be changed into another prime (61228907503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30614453756 + 30614453757.

It is an arithmetic number, because the mean of its divisors is an integer number (30614453757).

Almost surely, 2^61228907513 is an apocalyptic number.

It is an amenable number.

61228907513 is a deficient number, since it is larger than the sum of its proper divisors (1).

61228907513 is an equidigital number, since it uses as much as digits as its factorization.

61228907513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 44.

The spelling of 61228907513 in words is "sixty-one billion, two hundred twenty-eight million, nine hundred seven thousand, five hundred thirteen".