77801897 has 2 divisors, whose sum is σ = 77801898. Its totient is φ = 77801896.

The previous prime is 77801891. The next prime is 77801917. The reversal of 77801897 is 79810877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73685056 + 4116841 = 8584^2 + 2029^2 .

It is an emirp because it is prime and its reverse (79810877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77801897 - 2⁶ = 77801833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77801891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38900948 + 38900949.

It is an arithmetic number, because the mean of its divisors is an integer number (38900949).

Almost surely, 2^77801897 is an apocalyptic number.

It is an amenable number.

77801897 is a deficient number, since it is larger than the sum of its proper divisors (1).

77801897 is an equidigital number, since it uses as much as digits as its factorization.

77801897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 197568, while the sum is 47.

The square root of 77801897 is about 8820.5383622543. The cubic root of 77801897 is about 426.9038407787.

The spelling of 77801897 in words is "seventy-seven million, eight hundred one thousand, eight hundred ninety-seven".