77980361 has 2 divisors, whose sum is σ = 77980362. Its totient is φ = 77980360.

The previous prime is 77980321. The next prime is 77980369. The reversal of 77980361 is 16308977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68641225 + 9339136 = 8285^2 + 3056^2 .

It is a cyclic number.

It is not a de Polignac number, because 77980361 - 2⁶ = 77980297 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77980369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38990180 + 38990181.

It is an arithmetic number, because the mean of its divisors is an integer number (38990181).

Almost surely, 2^77980361 is an apocalyptic number.

It is an amenable number.

77980361 is a deficient number, since it is larger than the sum of its proper divisors (1).

77980361 is an equidigital number, since it uses as much as digits as its factorization.

77980361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 77980361 is about 8830.6489569001. The cubic root of 77980361 is about 427.2300058676.

The spelling of 77980361 in words is "seventy-seven million, nine hundred eighty thousand, three hundred sixty-one".