77998229 has 2 divisors, whose sum is σ = 77998230. Its totient is φ = 77998228.

The previous prime is 77998223. The next prime is 77998231. The reversal of 77998229 is 92289977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40666129 + 37332100 = 6377^2 + 6110^2 .

It is a cyclic number.

It is not a de Polignac number, because 77998229 - 2⁴ = 77998213 is a prime.

Together with 77998231, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77998223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38999114 + 38999115.

It is an arithmetic number, because the mean of its divisors is an integer number (38999115).

Almost surely, 2^77998229 is an apocalyptic number.

It is an amenable number.

77998229 is a deficient number, since it is larger than the sum of its proper divisors (1).

77998229 is an equidigital number, since it uses as much as digits as its factorization.

77998229 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 53.

The square root of 77998229 is about 8831.6606026273. The cubic root of 77998229 is about 427.2626344365.

The spelling of 77998229 in words is "seventy-seven million, nine hundred ninety-eight thousand, two hundred twenty-nine".