77130197 has 2 divisors, whose sum is σ = 77130198. Its totient is φ = 77130196.

The previous prime is 77130181. The next prime is 77130203. The reversal of 77130197 is 79103177.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68046001 + 9084196 = 8249^2 + 3014^2 .

It is an emirp because it is prime and its reverse (79103177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77130197 - 2⁴ = 77130181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77130167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38565098 + 38565099.

It is an arithmetic number, because the mean of its divisors is an integer number (38565099).

Almost surely, 2^77130197 is an apocalyptic number.

It is an amenable number.

77130197 is a deficient number, since it is larger than the sum of its proper divisors (1).

77130197 is an equidigital number, since it uses as much as digits as its factorization.

77130197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9261, while the sum is 35.

The square root of 77130197 is about 8782.3799166285. The cubic root of 77130197 is about 425.6717349599.

The spelling of 77130197 in words is "seventy-seven million, one hundred thirty thousand, one hundred ninety-seven".