61320713 has 2 divisors, whose sum is σ = 61320714. Its totient is φ = 61320712.

The previous prime is 61320673. The next prime is 61320731. The reversal of 61320713 is 31702316.

It is a happy number.

Together with next prime (61320731) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55234624 + 6086089 = 7432^2 + 2467^2 .

It is a cyclic number.

It is not a de Polignac number, because 61320713 - 2¹⁰ = 61319689 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61320313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30660356 + 30660357.

It is an arithmetic number, because the mean of its divisors is an integer number (30660357).

Almost surely, 2^61320713 is an apocalyptic number.

It is an amenable number.

61320713 is a deficient number, since it is larger than the sum of its proper divisors (1).

61320713 is an equidigital number, since it uses as much as digits as its factorization.

61320713 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 23.

The square root of 61320713 is about 7830.7543059401. The cubic root of 61320713 is about 394.3383957511.

The spelling of 61320713 in words is "sixty-one million, three hundred twenty thousand, seven hundred thirteen".