61771513 has 2 divisors, whose sum is σ = 61771514. Its totient is φ = 61771512.

The previous prime is 61771487. The next prime is 61771529. The reversal of 61771513 is 31517716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42341049 + 19430464 = 6507^2 + 4408^2 .

It is a cyclic number.

It is not a de Polignac number, because 61771513 - 2⁵ = 61771481 is a prime.

It is not a weakly prime, because it can be changed into another prime (61771573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885756 + 30885757.

It is an arithmetic number, because the mean of its divisors is an integer number (30885757).

Almost surely, 2^61771513 is an apocalyptic number.

It is an amenable number.

61771513 is a deficient number, since it is larger than the sum of its proper divisors (1).

61771513 is an equidigital number, since it uses as much as digits as its factorization.

61771513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4410, while the sum is 31.

The square root of 61771513 is about 7859.4855429602. The cubic root of 61771513 is about 395.3023652919.

The spelling of 61771513 in words is "sixty-one million, seven hundred seventy-one thousand, five hundred thirteen".