77213111 has 2 divisors, whose sum is σ = 77213112. Its totient is φ = 77213110.

The previous prime is 77213089. The next prime is 77213113. The reversal of 77213111 is 11131277.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77213111 - 2¹⁰ = 77212087 is a prime.

Together with 77213113, 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 (77213113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38606555 + 38606556.

It is an arithmetic number, because the mean of its divisors is an integer number (38606556).

Almost surely, 2^77213111 is an apocalyptic number.

77213111 is a deficient number, since it is larger than the sum of its proper divisors (1).

77213111 is an equidigital number, since it uses as much as digits as its factorization.

77213111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 294, while the sum is 23.

The square root of 77213111 is about 8787.0991231464. The cubic root of 77213111 is about 425.8242109387.

Adding to 77213111 its reverse (11131277), we get a palindrome (88344388).

The spelling of 77213111 in words is "seventy-seven million, two hundred thirteen thousand, one hundred eleven".