77081197 has 2 divisors, whose sum is σ = 77081198. Its totient is φ = 77081196.

The previous prime is 77081167. The next prime is 77081201. The reversal of 77081197 is 79118077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73599241 + 3481956 = 8579^2 + 1866^2 .

It is an emirp because it is prime and its reverse (79118077) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77081197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77081167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38540598 + 38540599.

It is an arithmetic number, because the mean of its divisors is an integer number (38540599).

Almost surely, 2^77081197 is an apocalyptic number.

It is an amenable number.

77081197 is a deficient number, since it is larger than the sum of its proper divisors (1).

77081197 is an equidigital number, since it uses as much as digits as its factorization.

77081197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24696, while the sum is 40.

The square root of 77081197 is about 8779.5897967957. The cubic root of 77081197 is about 425.5815742778.

The spelling of 77081197 in words is "seventy-seven million, eighty-one thousand, one hundred ninety-seven".