77677121 has 2 divisors, whose sum is σ = 77677122. Its totient is φ = 77677120.

The previous prime is 77677079. The next prime is 77677133. The reversal of 77677121 is 12177677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75881521 + 1795600 = 8711^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 77677121 - 2⁶ = 77677057 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77677421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38838560 + 38838561.

It is an arithmetic number, because the mean of its divisors is an integer number (38838561).

Almost surely, 2^77677121 is an apocalyptic number.

It is an amenable number.

77677121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77677121 is an equidigital number, since it uses as much as digits as its factorization.

77677121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28812, while the sum is 38.

The square root of 77677121 is about 8813.4624864465. The cubic root of 77677121 is about 426.6755007801.

The spelling of 77677121 in words is "seventy-seven million, six hundred seventy-seven thousand, one hundred twenty-one".