61770013 has 2 divisors, whose sum is σ = 61770014. Its totient is φ = 61770012.

The previous prime is 61769999. The next prime is 61770053. The reversal of 61770013 is 31007716.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57198969 + 4571044 = 7563^2 + 2138^2 .

It is a cyclic number.

It is not a de Polignac number, because 61770013 - 2⁹ = 61769501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61770013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61770053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30885006 + 30885007.

It is an arithmetic number, because the mean of its divisors is an integer number (30885007).

Almost surely, 2^61770013 is an apocalyptic number.

It is an amenable number.

61770013 is a deficient number, since it is larger than the sum of its proper divisors (1).

61770013 is an equidigital number, since it uses as much as digits as its factorization.

61770013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 882, while the sum is 25.

The square root of 61770013 is about 7859.3901162876. The cubic root of 61770013 is about 395.2991655519.

Adding to 61770013 its reverse (31007716), we get a palindrome (92777729).

The spelling of 61770013 in words is "sixty-one million, seven hundred seventy thousand, thirteen".