61820030317 has 2 divisors, whose sum is σ = 61820030318. Its totient is φ = 61820030316.

The previous prime is 61820030227. The next prime is 61820030357. The reversal of 61820030317 is 71303002816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58595948356 + 3224081961 = 242066^2 + 56781^2 .

It is a cyclic number.

It is not a de Polignac number, because 61820030317 - 2¹⁹ = 61819506029 is a prime.

It is a super-2 number, since 2×61820030317² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61820030357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30910015158 + 30910015159.

It is an arithmetic number, because the mean of its divisors is an integer number (30910015159).

Almost surely, 2^61820030317 is an apocalyptic number.

It is an amenable number.

61820030317 is a deficient number, since it is larger than the sum of its proper divisors (1).

61820030317 is an equidigital number, since it uses as much as digits as its factorization.

61820030317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 31.

The spelling of 61820030317 in words is "sixty-one billion, eight hundred twenty million, thirty thousand, three hundred seventeen".