77338913 has 2 divisors, whose sum is σ = 77338914. Its totient is φ = 77338912.

The previous prime is 77338871. The next prime is 77338927. The reversal of 77338913 is 31983377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44528929 + 32809984 = 6673^2 + 5728^2 .

It is an emirp because it is prime and its reverse (31983377) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77338913 - 2²² = 73144609 is a prime.

It is not a weakly prime, because it can be changed into another prime (77338993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38669456 + 38669457.

It is an arithmetic number, because the mean of its divisors is an integer number (38669457).

Almost surely, 2^77338913 is an apocalyptic number.

It is an amenable number.

77338913 is a deficient number, since it is larger than the sum of its proper divisors (1).

77338913 is an equidigital number, since it uses as much as digits as its factorization.

77338913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 41.

The square root of 77338913 is about 8794.2545448719. The cubic root of 77338913 is about 426.0553481540.

The spelling of 77338913 in words is "seventy-seven million, three hundred thirty-eight thousand, nine hundred thirteen".